test: refactor old tests and cleanup test helpers #5338

Job	Run time
Build	2m 4s
E2E tests (ubuntu-latest)	6m 26s
Format check	33s
E2E tests (windows-latest)	10m 5s
Integration tests (ubuntu-latest)	53s
Linter	2m 52s
Integration tests (windows-latest)	1m 36s
E2E tests (macos-latest)	6m 49s
Integration tests (macos-latest)	1m 2s
Unit tests (ubuntu-latest)	1m 0s
Unit tests (windows-latest)	1m 47s
Unit tests (macos-latest)	1m 8s
	36m 15s

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