ci: gate visual regression tests by path

[dancormier]

Summary

Gates the visual regression suite so it only runs when visual-test-relevant files change. It also updates our workflows to use node v24 (via actions/setup-node@v5)

Related Issue

STACKS-887

Changes

• Adds a dorny/paths-filter check for visual regression relevant paths.
• Moves visual regression tests into a dedicated gated workflow job.
• Preserves release behavior when the visual regression job is intentionally skipped.

Testing

Verify test runs in this PR

Verify visual regression tests complete successfully when changes are present in packages/stacks-classic

• Change to packages/stacks-classic/README.md: bd76203
• Commit with completed workflow that includes visual regression test run: b69ece2
• Successful visual regression test run
  • Note: it runs "Detect changes", which reports that there are changes to Stacks Classic, with the visual regression tests running after

Verify visual regression tests are skipped when changes are not present in packages/stacks-classic

• Commit reverting changes to packages/stacks-classic/README.md: ec365b4
• Skipped visual regression test run

Manually testing

• In this PR, push a small change to a file within packages/stacks-classic (I suggest adding a comment to README.md
• Verify the visual regression job runs and completes successfully
• Revert your change and verify that the visual regression job is skipped

[changeset-bot]

⚠️ No Changeset found

Latest commit: ec365b4

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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