WPB-22168 [fix-up] set the defaults of the cells feature correctly

[battermann]

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

[Copilot]

Pull request overview

This PR is a fix-up for WPB-22168 that corrects the default configuration values for the cells team feature flag. The title indicates this is a follow-up fix to ensure proper defaults are set.

Key Changes:

• Changes the cells feature flag defaults from enabled/unlocked to disabled/locked
• Updates the changelog entry to reference related PRs (#4889, #4907)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
charts/galley/values.yaml	Corrects cells feature defaults to disabled/locked, aligning with the pattern used by most other feature flags
changelog.d/2-features/WPB-22168	Adds PR references to the changelog entry for traceability

The changes look correct and align with the established convention in the codebase where most feature flags default to status: disabled with lockStatus: locked. The cells feature (the public-facing feature) is now properly configured to be disabled and locked by default, while cellsInternal (the internal feature) remains enabled and unlocked as intended. The changelog update appropriately links to the related PRs for traceability.

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