Performance tests tooling : Compare performance with correct branch

[cbravobernal]

What?

Target Performance tests to base branch instead of just Trunk.

Why?

If trunk differs from another base branch, like wp/6.7, changing for example selectors. Performance tests will fail on all cherry picks to releases branches.

Testing Instructions

I'll make this PR to 6.7 to see if performance is being executed there.

[github-actions]

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Co-authored-by: cbravobernal <[email protected]>
Co-authored-by: youknowriad <[email protected]>
Co-authored-by: SantosGuillamot <[email protected]>

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[SantosGuillamot]

Thanks for the fix 🙂 I wasn't sure why the performance tests were failing in manual cherry picks like this one: link.

[github-actions]

I just cherry-picked this PR to the wp/6.7 branch to get it included in the next release: f98cdf7

[github-actions]

Warning: Type of PR label mismatch

To merge this PR, it requires exactly 1 label indicating the type of PR. Other labels are optional and not being checked here.

• Type-related labels to choose from: [Type] Automated Testing, [Type] Breaking Change, [Type] Bug, [Type] Build Tooling, [Type] Code Quality, [Type] Copy, [Type] Developer Documentation, [Type] Enhancement, [Type] Experimental, [Type] Feature, [Type] New API, [Type] Task, [Type] Technical Prototype, [Type] Performance, [Type] Project Management, [Type] Regression, [Type] Security, [Type] WP Core Ticket, Backport from WordPress Core, Gutenberg Plugin.
• Labels found: [Type] Bug, [Type] Build Tooling, Backported to WP Core.

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