fixes for integration test rate limit issues (#8538)

* constrain auto-close and enforce-dependency-review triggers

we don't need to run these on PR close or when we apply labels, for example

* skip workflows on push to dependabot branch

* use PAT if available else fall back to workflow token

* further constrain pull_request triggers

Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>