Enhancement/#8154 - Implement the “Top content” metric handling OAuth flow

[hussain-t]

Summary

Addresses issue:

• Implement the “Top content” metric handling OAuth flow #8154

Relevant technical choices

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 7.4.
• 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 115c349 have been deleted.

[github-actions]

Size Change: +250 B (+0.01%)

Total Size: 1.8 MB

Filename	Size	Change
./dist/assets/js/googlesitekit-main-dashboard-********************.js	155 kB	+82 B (+0.05%)
./dist/assets/js/googlesitekit-modules-analytics-4-********************.js	168 kB	+79 B (+0.05%)
./dist/assets/js/googlesitekit-widgets-********************.js	85.4 kB	+89 B (+0.1%)

ℹ️ View Unchanged

Filename	Size
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./dist/assets/css/googlesitekit-adminbar-css-********************.min.css	11.8 kB
./dist/assets/css/googlesitekit-authorize-application-css-********************.min.css	846 B
./dist/assets/css/googlesitekit-wp-dashboard-css-********************.min.css	8.2 kB
./dist/assets/js/31-********************.js	2.76 kB
./dist/assets/js/32-********************.js	2.25 kB
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./dist/assets/js/googlesitekit-consent-mode-********************.js	25.6 kB
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./dist/assets/js/googlesitekit-datastore-site-********************.js	20.3 kB
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./dist/assets/js/googlesitekit-wp-dashboard-********************.js	61.8 kB
./dist/assets/js/runtime-********************.js	1.3 kB

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[techanvil]

Thanks @hussain-t - this is mostly working, but needs a bit of further attention as per my comments.

[techanvil]

That's great, thanks @hussain-t. LGTM!