Duplicate entries appear for `googlesitekit-components` in `manifest.php` when rebuilding via `npm run watch`

[techanvil]

Bug Description

When running npm run watch, and manifest.php is regenerated in response to a watched file changing, the resulting manifest will contain duplicate arrays in the entry for googlesitekit-components.

Steps to reproduce

1. Run npm run watch.
2. Change and save a watched JS file.
3. Examine dist/manifest.php.
4. See duplicate arrays in the entry for googlesitekit-components.

Example output:

$ cat dist/manifest.php
<?php
/**
 * @package   Google\Site_Kit
 * @copyright 2024 Google LLC
 * @license   https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
 * @link      https://sitekit.withgoogle.com
 */

return array(
        'analytics-advanced-tracking'              => array( "analytics-advanced-tracking.js", "7b7d732ada39b258bbfb" ),
        'googlesitekit-i18n'                       => array( "googlesitekit-i18n.js", "4a53d51d35a2374fe523" ),
        'googlesitekit-idea-hub-notice'            => array( "googlesitekit-idea-hub-notice.js", "3041b23b224c73aeb7f8" ),
        'googlesitekit-activation'                 => array( "googlesitekit-activation.js", "107c1f45c97bd974cb0a" ),
        'googlesitekit-adminbar'                   => array( "googlesitekit-adminbar.js", "f39672395532ba984600" ),
        'googlesitekit-api'                        => array( "googlesitekit-api.js", "f73276ac05f23eb18efe" ),
        'googlesitekit-base'                       => array( "googlesitekit-base.js", "e9b9158e8c5a43f827c9" ),
        'googlesitekit-components'                 => array( array( "googlesitekit-components-gm2.js", "778812a1d7bb75f926df" ), array( "googlesitekit-components-gm3.js", "2da5adf37ba5a41f9bc8" ), array( "googlesitekit-components-gm2.js", "778812a1d7bb75f926df" ), array( "googlesitekit-components-gm3.js", "2da5adf37ba5a41f9bc8" ) ),
        'googlesitekit-data'                       => array( "googlesitekit-data.js", "ed5cde627e555a4d4e6f" ),
        'googlesitekit-datastore-forms'            => array( "googlesitekit-datastore-forms.js", "a2faba4e9e72a5f11830" ),
        'googlesitekit-datastore-location'         => array( "googlesitekit-datastore-location.js", "9326bfdf366b1411e20a" ),
        'googlesitekit-datastore-site'             => array( "googlesitekit-datastore-site.js", "9e80a2f6dab5804730ee" ),
        'googlesitekit-datastore-ui'               => array( "googlesitekit-datastore-ui.js", "67073ab875fd3848fbf8" ),
        'googlesitekit-datastore-user'             => array( "googlesitekit-datastore-user.js", "814132f6d3da7922c37a" ),
        'googlesitekit-entity-dashboard'           => array( "googlesitekit-entity-dashboard.js", "a6db9008275aae6dc83f" ),
        'googlesitekit-idea-hub-post-list'         => array( "googlesitekit-idea-hub-post-list.js", "31efff5f8c1d537f5251" ),
        'googlesitekit-main-dashboard'             => array( "googlesitekit-main-dashboard.js", "2ab5350bdc853a47114e" ),
        'googlesitekit-modules'                    => array( "googlesitekit-modules.js", "c48b465fc35cc6a3f6da" ),
        'googlesitekit-modules-adsense'            => array( "googlesitekit-modules-adsense.js", "6c81aab8b5600f9754d2" ),
        'googlesitekit-modules-analytics'          => array( "googlesitekit-modules-analytics.js", "e77b66375746e1b12507" ),
        'googlesitekit-modules-analytics-4'        => array( "googlesitekit-modules-analytics-4.js", "b8e0d15464e79b111819" ),
        'googlesitekit-modules-idea-hub'           => array( "googlesitekit-modules-idea-hub.js", "2d330b1e9aaa925fabe4" ),
        'googlesitekit-modules-optimize'           => array( "googlesitekit-modules-optimize.js", "feaedc7527821aac5301" ),
        'googlesitekit-modules-pagespeed-insights' => array( "googlesitekit-modules-pagespeed-insights.js", "8ef10986c19025ada637" ),
        'googlesitekit-modules-search-console'     => array( "googlesitekit-modules-search-console.js", "3ebd3d12f70707ffdeec" ),
        'googlesitekit-modules-tagmanager'         => array( "googlesitekit-modules-tagmanager.js", "3c3cd03adeba7e56dfe5" ),
        'googlesitekit-modules-thank-with-google'  => array( "googlesitekit-modules-thank-with-google.js", "06886c2a3268aa3de44b" ),
        'googlesitekit-polyfills'                  => array( "googlesitekit-polyfills.js", "b5d338c872cc7b4ac26f" ),
        'googlesitekit-settings'                   => array( "googlesitekit-settings.js", "0b8f09a584b065da92c9" ),
        'googlesitekit-splash'                     => array( "googlesitekit-splash.js", "ff2a796799f9d7eb8c54" ),
        'googlesitekit-user-input'                 => array( "googlesitekit-user-input.js", "bd6ab5f84438307fccde" ),
        'googlesitekit-vendor'                     => array( "googlesitekit-vendor.js", "cd81019972e22be2480d" ),
        'googlesitekit-widgets'                    => array( "googlesitekit-widgets.js", "8d0289fac2447e50ec21" ),
        'googlesitekit-wp-dashboard'               => array( "googlesitekit-wp-dashboard.js", "ef922f88f3a08d49b9af" ),
        'googlesitekit-runtime'                    => array( "runtime.js", "c5c65a40776b05c29a57" ),
        'googlesitekit-admin-css'                  => array( "googlesitekit-admin-css.css", "80c918d4ee06b28fb9f7" ),
        'googlesitekit-adminbar-css'               => array( "googlesitekit-adminbar-css.css", "4007f4230ae6ffd502a5" ),
        'googlesitekit-wp-dashboard-css'           => array( "googlesitekit-wp-dashboard-css.css", "2a8dfa439b04e256fcec" ),
);

Additional Context

• PHP Version: N/A
• OS: any
• Browser: N/A
• Plugin Version: Introduced in 1.89.0
• Device: N/A

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Acceptance criteria

• When running through the steps to reproduce, the manifest entry should not contain duplicate arrays in the entry for googlesitekit-components.
• In other words the value should look like this, with a single nested array entry for each of the googlesitekit-components-gm2.js and googlesitekit-components-gm3.js assets:

array( array( "googlesitekit-components-gm2.js", "778812a1d7bb75f926df" ), array( "googlesitekit-components-gm3.js", "2da5adf37ba5a41f9bc8" ) )

Implementation Brief

• [ ]

Test Coverage

QA Brief

Changelog entry