CI: Use kubernetes based GHA self-hosted runners MGX-668 #1174

Job	Run time
Delete fungible environment	0s
Global init	3s
Build / Clippy check	1m 54s
Build / Run try-runtime checks	7m 43s
Build / Export wasm artifacts	7m 54s
Build / Build Docker image	1h 5m 42s
Build / Run runtime benchmarks	8m 25s
Build / Coverage report	6m 10s
Build / Run benchmark tests	3m 21s
Build / Formatting check	50s
Build / Unit tests	11m 41s
Deploy `dev` environment	0s
Run e2e tests	0s
Deploy fungible environment	0s
run-perf-tests-dev	0s
run-perf-tests-branch	0s
performance tests in dev	0s
performance tests in branch	0s
	1h 53m 43s

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