ci: don't run CI on draft PRs (#7518)
PR adds a resuable workflow that prevents CI to run on draft PRs. To run CI on draft a new label is introduced: `A5-run-CI`. To run the CI the label should be added and en empty commit should be pushed. close https://github.com/paritytech/ci_cd/issues/1099 close https://github.com/paritytech/polkadot-sdk/issues/7168
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