ci: replace styfle/cancel-workflow-action with native GitHub concurrency

[Copilot]

Removes the third-party styfle/cancel-workflow-action from all workflows, replacing it with GitHub Actions' built-in concurrency at the workflow level.

Changes

• .github/workflows/test-and-release.yaml, test-e2e.yaml, release.yaml: Removed styfle/cancel-workflow-action step; added top-level concurrency block:

concurrency:
    group: ${{ github.workflow }}-${{ github.ref }}
    cancel-in-progress: true

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