ci: Require the review of Percy visual tests

[bartaz]

Done

• Adds a CI check that enforces Percy review and adding Review: Percy +1 label.
• Adds a Review: Percy needed automatically if any files in src are changed.

QA

• Check that there is no Review: Percy +1 label on the PR.
• Check that CI is failing on "PR Percy Review Label Required" job
• Find a bot comment describing why merging is blocked that describes what to do
• Follow the comment instructions
• After reviewing Percy, add Review: Percy +1 label
• Make sure CI passes

[webteam-app]

Demo starting at https://react-components-1056.demos.haus

[bartaz]

Ah, thanks, forgot about this one :)

[lorumic]

Ah, thanks, forgot about this one :)

I rebased #1063 on main now, so it can be seen in "real" action there (meaning that some actual differences in Percy are expected for that PR). :)
I hope this will not discourage people from reviewing it! 😅

[github-actions]

🎉 This PR is included in version 0.51.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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