Remove `ga4AdSenseIntegration` feature flag to launch GA4 + AdSense integration feature

[tofumatt]

Feature Description

We should remove the ga4AdSenseIntegration feature flag to deploy that feature fully to users in the 1.124.0 release.

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Acceptance criteria

• The ga4AdSenseIntegration feature flag should be removed from the plugin.
• With the feature flag removed, code should be updated where needed so that it functions as-if the feature flag were enabled. Essentially, ga4AdSenseIntegration should act like it's always on.
• Any tests that rely on ga4AdSenseIntegration should continue to pass.
• Any code/tests that rely on ga4AdSenseIntegration being disabled can be removed.

Implementation Brief

• [ ] Removal from Feature Flags: Remove the ga4AdSenseIntegration from the feature-flags.json file.
• [ ] Code Search and Review: Conduct a thorough search throughout the code base for the ga4AdSenseIntegration string. Examine each instance where it is used.
  • [ ] For any logic or component/widget rendered conditionally based on the ga4AdSenseIntegration feature flag, adjust the code to ensure these are rendered unconditionally.
  • [ ] Search for and remove any instances where the isFeatureEnabled( 'ga4AdSenseIntegration' ) utility function is used.
  • [ ] Any code segments that were executed only when the feature flag was disabled should now be removed entirely.
• [ ] Removal of Hook Usage: Search for and remove any instances where the useFeature hook is utilized with ga4AdSenseIntegration as an argument.
• [ ] Removal from Server Logic:
  • [ ] Search for and remove any instances where the Feature_Flags::enabled( 'ga4AdSenseIntegration' ) method is used in server logic.
  • [ ] Search for and remove any instances where the enable_feature( 'ga4AdSenseIntegration' ) method is used in PHP test files.
  • [ ] Note: I couldn't find any server logic that uses the ga4AdSenseIntegration feature flag. However, it is better to double-check this.
• [ ] Story Parameters Update: Scrutinize the story parameters in which the ga4AdSenseIntegration feature is activated. Here, it is necessary to remove this particular parameter.

Test Coverage

• [ ] Review and update the VRT images as required to ensure they align with removing the ga4AdSenseIntegration feature flag.

QA Brief

• The ga4AdSenseIntegration feature flag should not appear in the list of feature flags when using the tester plugin.
• Testing this issue realistically involves going through all flows for GA4 + AdSense integration, see this doc: https://docs.google.com/document/d/1FtdDt1_AMe9sE-sEkA_ZjWSEhhthkOJi_aLRdr5vHD0/edit?usp=sharing

Essentially: test that GA4 + AdSense features appear without the ga4AdSenseIntegration being enabled.

Changelog entry

• N/A

[eugene-manuilov]

IB ✔️

[tofumatt]

(I realised today this is actually due for the next sprint, but leaving it assigned to me as I've nearly completed the issue already 😅)

[kuasha420]

@tofumatt Can you add a QAB here - as you have more context about the whole thing and may want to get some specific stuff QA'd. Feel free to unassign yourself afterwards. Cheers.

[tofumatt]

@kuasha420 Oh my, I just totally forgot, yes! Thanks 😅

[wpdarren]

QA Update: ✅

Verified:

• The ga4AdSenseIntegration feature flag does not appear in the list of feature flags when using the tester plugin.
• I reviewed the testing notes and ensured all functionality was working as expected. I did spot a few issues, but these were fixed as part of the 1.124.0 release or are post-launch.