ci: convert remaining Azure Pipelines PR checks to Github Actions #333

Job	Run time
JavaScript Tests	2m 38s
Check Yarn Constraints	37s
Lint PR title	21s
NPM Publish (Dry Run)	35s
Test react-native-macos init / Test react-native-macos init	6m 3s
Test react-native-test-app integration / Test react-native-test-app integration	6m 19s
Build the website / Build the website	49s
Build RNTester / ios, newarch, jsc	16m 15s
Build RNTester / xros, oldarch, jsc	25m 46s
Build RNTester / xros, oldarch, hermes	25m 29s
Build RNTester / macos, oldarch, hermes	15m 6s
Build RNTester / macos, oldarch, jsc	25m 4s
Build RNTester / macos, newarch, jsc	14m 23s
Build RNTester / ios, newarch, hermes	25m 17s
Build RNTester / ios, oldarch, hermes	26m 25s
Build RNTester / xros, newarch, jsc	23m 22s
Build RNTester / macos, newarch, hermes	18m 17s
Build RNTester / xros, newarch, hermes	22m 19s
Build RNTester / ios, oldarch, jsc	14m 31s
	4h 29m 36s

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