Add stale action to mark issues and PRs as stale and close them #1131

Job	Run time
Construct integration test matrix	9s
Vsock tests	2m 2s
Benchmarks / Construct Benchmarks matrix	4s
Cxx interop / Construct Cxx interop matrix	5s
Unit tests / Construct unit test matrix	3s
Soundness / Documentation check	2m 12s
Soundness / API breakage check	2m 5s
Soundness / Broken symlinks check	5s
Soundness / Format check	46s
Soundness / License headers check	10s
Soundness / Python lint check	8s
Soundness / Shell check	35s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	4s
Unit tests / Unit tests / Linux (5.9)	3m 47s
Unit tests / Unit tests / Linux (5.10)	3m 54s
Unit tests / Unit tests / Linux (6.0)	4m 9s
Unit tests / Unit tests / Linux (nightly-6.0)	4m 34s
Unit tests / Unit tests / Linux (nightly-main)	4m 16s
Benchmarks / Benchmarks / Linux (5.9)	5m 20s
Benchmarks / Benchmarks / Linux (5.10)	4m 58s
Benchmarks / Benchmarks / Linux (6.0)	5m 11s
Benchmarks / Benchmarks / Linux (nightly-6.0)	5m 59s
Benchmarks / Benchmarks / Linux (nightly-main)	4m 12s
Cxx interop / Cxx interop / Linux (5.9)	1m 10s
Cxx interop / Cxx interop / Linux (5.10)	1m 15s
Cxx interop / Cxx interop / Linux (6.0)	1m 15s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 34s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 30s
Integration tests / Linux (5.9)	15m 25s
Integration tests / Linux (5.10)	14m 2s
Integration tests / Linux (6.0)	16m 9s
Integration tests / Linux (nightly-6.0)	16m 32s
Integration tests / Linux (nightly-main)	15m 42s
	2h 19m 24s

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