Fix VRT "Failed to launch" failure and other key unstable VRTs

[benbowler]

Summary

Addresses issue:

• Fix remaining issue where VRT test fails in CI when launching Chromium #9406

Relevant technical choices

I spent some time looking into possible solutions to this. I used the troubleshooting guide for Alpine Linux to update the way Chromium is installed in our Docker container.

I created a batch test GitHub action that runs the backstop tests 25X and on my first run, over ~20 tests, it didn't trigger the browser error once! However switching to a new version of Chromium did render a few tests differently so I had to accept those changes. This new version also raised some new unstable tests:

• AudienceSegmentation_Dashboard_AudienceSelectionPanel_Audience_creation_notice for unknown reasons.
• WPDashboardApp_WPDashboardWidgets_ReadyWithActivateAnalyticsCTA for unknown reasons.
• AdSense_Module_Overview_Widget which was another case of the DataBlockGroup component causing issues.

While here I found ways to fix these failing tests and re-ran a batch test.

My new batch test appears to pass reliably without any "Failed to launch browser" errors! It's not 100% unfortunately with some inconsistent tests failing occasionally (3/20 in my last batch test) but it is an improvement from our previous situation.

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]

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[github-actions]

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Total Size: 1.86 MB

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