Update GitHub Actions workflow for post-7.1

[desrosj]

This applies the necessary changes to the GitHub Actions workflows for after the 7.1 final release corresponding to steps 3 & 4 of the release checklist.

Trac ticket: Core-65845.

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[Copilot]

Pull request overview

This pull request updates the WordPress core GitHub Actions workflows to reflect the post–7.1 final release state (per the release checklist), shifting upgrade-test targets from pre-release/older versions to the latest released versions and updating the performance baseline.

Changes:

• Update upgrade testing matrices to replace 7.1-RC2 with the final 7.1 release and drop 6.9 from the “two most recent releases” set.
• Align develop upgrade testing matrices to use 7.0 and 7.1 as upgrade sources (plus 5.3 where needed).
• Update the reusable performance test workflow’s baseline tag default from 7.0.0 to 7.1.0.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/upgrade-testing.yml	Updates the “recent releases” upgrade matrix to test 7.0 → latest and 7.1 → latest.
.github/workflows/upgrade-develop-testing.yml	Updates develop upgrade matrices to use 7.0 and 7.1 (and removes 7.1-RC2/6.9).
.github/workflows/reusable-performance-test-v2.yml	Updates the default performance baseline tag to 7.1.0.

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