Launch SFR Phase 4 by force-enabling the feature flag in the plugin

[techanvil]

Feature Description

In order to launch Setup Flow Refresh Phase 4, we need to override the setupFlowRefreshPhase4 feature flag status to true in the plugin. We can use the googlesitekit_is_feature_enabled filter to achieve this.

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Do not alter or remove anything below. The following sections will be managed by moderators only.

Acceptance criteria

• The setupFlowRefreshPhase4 feature flag is overridden to true in the plugin.
• The Setup Flow Refresh Phase 4 features are enabled by default and continue to work as expected.

Implementation Brief

• In includes/Plugin.php:

  • Add/extend a plugin-level googlesitekit_is_feature_enabled filter callback to force setupFlowRefreshPhase4 to true. We can use existing force_setup_flow_refresh_feature_enabled callback.
  • Keep the callback scoped to rollout flags only (setupFlowRefreshPhase4, and setupFlowRefresh); return the incoming $feature_enabled value unchanged for all other flags.
  • Register the callback in register() only when GOOGLESITEKIT_TESTS is not defined, matching the existing production-only force-enable pattern. It's already in place if we use existing callback.
  • Keep hook ordering aligned with the SFR rollout pattern: remote-features activation at priority 5, plugin force-enable at priority 10, so the forced value wins over remote defaults but can still be overridden by Site Kit Tester (11) for QA.
  • Add/update the temporary TODO note for later cleanup when forced SFR flags are removed.

• Follow the same minimal-change strategy used for setupFlowRefresh in Launch SFR by force-enabling the feature flag in the plugin #12966

Test Coverage

• No tests are required.

QA Brief

• Keep the setupFlowRefreshPhase4 feature flag disabled in the tester plugin, with "Do not override" selected for the "Force enabled feature flags" setting.

• Setup the SK plugin.

• Run following command in the browser console from SK dashboard. It should output list of enabled feature flags, which should also contains setupFlowRefreshPhase4.

    _googlesitekitBaseData.enabledFeatures

Changelog entry

[techanvil]

Thanks @ankitrox, this IB looks good, but I don't think we need any test coverage - we're not force-enabling the flag in the test environment, so there's nothing to test.

We didn't add test coverage in #12991 so this would be consistent.

[ankitrox]

Thanks @techanvil , agreed!
Updated the Test Coverage section.

[techanvil]

Thanks @ankitrox! That LGTM.

IB ✅