refactor: refactors jormungandr entrypoint script #3641

Job	Run time
Bootstrap cache	3s
Update dependencies	17s
Tests (windows-latest, debug, stable)	5m 4s
Lints	9s
Test Coverage	6m 57s
Tests (windows-latest, release, stable)	6m 38s
Tests (ubuntu-latest, debug, stable)	1m 44s
Tests (ubuntu-latest, release, stable)	3m 3s
Tests (macos-latest, debug, stable)	4m 37s
Tests (macos-latest, release, stable)	6m 18s
Tests (ubuntu-latest, debug, nightly)	1m 37s
	36m 27s

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