Add concurrency control to cancel in-progress PR workflows #3042
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When updating a pull request that's already open, each new commit can trigger a workflow. If the PR author doesn't have permission to cancel workflows, this can lead to unnecessary executions.
To avoid redundant executions and reduce resource usage, this change cancels any in-progress workflow for the same pull request when a new one is triggered by a commit push, ensuring only one active workflow per PR.