wp-env: Set core source to latest when null

[noahtallen]

What?

On trunk, there is a bug where if .wp-env.json sets "core": null, wp-env will crash. This PR handles that case.

Why?

The object spread operators which merge all of the configurations together override the default "latest version" string with this null value.

How?

In the overrides section of the config, we check if any of the core source values are still null, and then manually set the versions if needed. This means the core source should never be null.

Testing Instructions

1. Use the trunk branch to start
2. In Gutenberg's wp-env.json file, change "core" to be null
3. Run npx wp-env start --debug. Observe that the core source in the printed config file is null and that wp-env crashes.
4. Checkout this branch.
5. Keep the wp-env.json change from step 2.
6. Run npx wp-env start --debug. It should start successfully, and you should see a git core source printed in the config file.

[github-actions[bot]]

Size Change: 0 B

Total Size: 1.28 MB

ℹ️ View Unchanged

Filename	Size
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_{compressed-size-action}

[noahtallen]

Nice, I like that idea! Added.