[Tests] add fast GPU workflow to the PR CI

[sayakpaul]

As discussed with @DN6, we are considering to add a workflow that would run fast GPU tests on PRs that affect the core functionality of the library.

We might make it a must in order for those PRs to pass the entire CI before they can be merged.

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the contributing guidelines are likely to be ignored.