refactor: refactors jormungandr entrypoint script #3640

Job	Run time
Bootstrap cache	9s
Update dependencies	37s
Lints	10s
Tests (windows-latest, debug, stable)	4m 55s
Test Coverage	5m 28s
Tests (windows-latest, release, stable)	6m 42s
Tests (ubuntu-latest, debug, stable)	1m 35s
Tests (ubuntu-latest, release, stable)	2m 54s
Tests (macos-latest, debug, stable)	4m 38s
Tests (macos-latest, release, stable)	5m 43s
Tests (ubuntu-latest, debug, nightly)	1m 44s
	34m 35s

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