Scope GitHub Action workflows to specific branches on `pull_request`

[desrosj]

Some GHA workflows are not required in every branch. For example, the PHP Compatibility workflow was added in 5.5, and does not pass in previous branches.

The push trigger is already properly scoped to target branches and tags only matching push events >= 5.5. This needs to be copied over to the pull_request trigger as well.

This will prevent unnecessary workflows from running in older branches.

[desrosj]

In 50432:

Build/Test Tools: Limit when GitHub Action workflows run on pull_request.

Different branches have support for different types of testing based on the tooling that was in place at the time each version was branched. The workflows currently in place have patterns configured to match the relevant branches and tags for each workflow, but only for push events.

This copies the patterns for matching supported branches over to the pull_request event to prevent workflows from running for a pull request to a branch that does not support that workflow.

Fixes #52643.

[desrosj]

Reopening this to backport at some point.

[desrosj]

In 50584:

Build/Test Tools: Backport several GitHub Action improvements and dependency updates.

This backports several GitHub Action improvements and devDependency updates to the 5.7 branch.

Backports [50432,50435-50436,50479,50485-50487,50545,50579] to the 5.7 branch.
See #52667, #52643, #52658, #52660, #52624, #52625.

[desrosj]

This was included in [50602-50606].

This will be backported further next week, but going to close this out.