Enhance/#7598 - Fix failing E2E tests (follow-up)

[hussain-t]

Summary

Addresses issue:

• Add GA4 availableCustomDimensions module setting and relevant datastore infrastructure #7598

Relevant technical choices

• This follow-up PR addresses the e2e test failures from conditionally setting the availableCustomDimensions option when the newsKeyMetrics feature flag is enabled.
• Made setting the availableCustomDimensions default value unconditional to maintain consistency and prevent e2e test failures.

PR Author Checklist

• My code is tested and passes existing unit tests.
• My code has an appropriate set of unit tests which all pass.
• My code is backward-compatible with WordPress 5.2 and PHP 5.6.
• My code follows the WordPress coding standards.
• My code has proper inline documentation.
• I have added a QA Brief on the issue linked above.
• I have signed the Contributor License Agreement (see https://cla.developers.google.com/).

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Code Reviewer Checklist

• Run the code.
• Ensure the acceptance criteria are satisfied.
• Reassess the implementation with the IB.
• Ensure no unrelated changes are included.
• Ensure CI checks pass.
• Check Storybook where applicable.
• Ensure there is a QA Brief.

Merge Reviewer Checklist

• Ensure the PR has the correct target branch.
• Double-check that the PR is okay to be merged.
• Ensure the corresponding issue has a ZenHub release assigned.
• Add a changelog message to the issue.

[github-actions]

Build files for 530decc are ready:

• Download development build
• Download production build

[aaemnnosttv]

LGTM, thanks @hussain-t 👍