Skip non-wheel CI runs for tags

[hugovk]

Noticed during #7348, helps #7390.

When making a release, and pushing a tag, all the CI workflows run:

By the time we're making a release, the CI has already tested all merges to main. Checking this is one of the first items in the release checklist.

We can save some CI time and skip the non-wheels workflows for tag pushes.

The wheels workflows:

• wheels.yml
• test-windows.yml (for now)
• I also left lint.yml there: it's quick to run

By default, all branches and tags are run. By explicitly specifying all branches branches: "**"has the same effect as not specifying atags:` key, and not triggering for tags. Ref: https://stackoverflow.com/a/71879890/724176

Demo

Pushing as main to my fork, all run:

Pushing a tag, only the wheels+lint workflows run: