Workflow efficiency improvements:

[kirkrodrigues]

• Run build_wheels workflow only when relevant files change.
• Cancel in-progress jobs when another commit is pushed to a branch.

Description

The build_wheels workflow concurrently runs on changes to any files in the repo (including docs) and allows concurrent workflow runs when only the latest change in a branch needs to be tested. To resolve this, this PR makes two changes:

1. The workflow is only run when relevant files are changed.
2. The workflow now uses a concurrency group that cancels in-progress jobs (from previous commits).

Validation performed

• Validated the workflow doesn't run when irrelevant files are changed.
• Validated in-progress runs are cancelled when a new commit is pushed to a branch.