Enhancement/11860 Email reports error notices

[jimmymadon]

Summary

Addresses issue:

• Implement error notice infrastructure in admin settings and email reports subscription panel #11860

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.
• Ensure there are no unexpected significant changes to file sizes.

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]

Storybook is ready:

• View Storybook

[github-actions]

Size Change: +826 B (+0.04%)

Total Size: 2.26 MB

ℹ️ View Unchanged

Filename	Size	Change
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./dist/assets/blocks/reader-revenue-manager/common/editor-styles.js	20 B	0 B
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./dist/assets/blocks/sign-in-with-google/editor-styles.css	84 B	0 B
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./dist/assets/css/googlesitekit-admin-css-********************.min.css	66 kB	+1 B (0%)
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./dist/assets/css/googlesitekit-authorize-application-css-********************.min.css	846 B	0 B
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./dist/assets/js/googlesitekit-events-provider-easy-digital-downloads-********************.js	655 B	0 B
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./dist/assets/js/googlesitekit-main-dashboard-********************.js	144 kB	+249 B (+0.17%)
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./dist/assets/js/googlesitekit-polyfills-********************.js	230 B	0 B
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./dist/assets/js/googlesitekit-user-input-********************.js	48.7 kB	0 B
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./dist/assets/js/runtime-********************.js	1.92 kB	0 B

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[github-actions]

Build files for eaa69a5 have been deleted.

[zutigrm]

Thanks @jimmymadon overall looking good, I suggested a few small tweaks and left some questions

[zutigrm]

LGTM

[eugene-manuilov]

Actually, there are merge conflicts that should be fixed.