[skip ci] Fix nightly workflow dispatch

Closes GH-16662

[skip ci] Move nightly to workflow_call

This PR removes most of the logic of nightly_matrix.php by converting
nightly.yml to a workflow_call, and invoking it multiple times for each bran

[skip ci] Move nightly to workflow_call

This PR removes most of the logic of nightly_matrix.php by converting
nightly.yml to a workflow_call, and invoking it multiple times for each branch
in a new root.yml workflow. The naming of the files is intentionally kept to
make the diff readable. They may still be renamed afterward.

Closes GH-16642

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Backport nightly.yml and nightly_matrix.php to PHP-8.1

These files are usually only used on master, as the cron trigger runs on master.
However, workflow_dispatch does use the file from

Backport nightly.yml and nightly_matrix.php to PHP-8.1

These files are usually only used on master, as the cron trigger runs on master.
However, workflow_dispatch does use the file from the triggered branch.
Furthermore, we're looking into migrating to a workflow_call trigger, which will
also run on the target branch. Backport these files now to make those changes
easier.

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Use per-branch matrix for windows nightly

I forgot this in the last PR.

[skip ci] Skip function JIT in nightly for ASAN

This avoids the 6h timeout.

Increase job timeout for ASAN/UBSAN build

[skip ci] Fix config param for variation build

Fix PHP-8.0 skipping for some jobs

Migrate variation job to GitHub actions

Migrate --repeat 2 job to GitHub actions

Add nightly for GitHub actions