test: improve test coverage for plugin-coverage (#1055) #6291

Job	Run time
Integration tests (ubuntu-latest)	1m 34s
Unit tests (macos-latest)	1m 12s
Unit tests (windows-latest)	2m 24s
Integration tests (macos-latest)	1m 52s
Format check	51s
Integration tests (windows-latest)	3m 9s
Unit tests (ubuntu-latest)	1m 17s
Build	1m 21s
E2E tests (ubuntu-latest)	7m 17s
E2E tests (windows-latest)	14m 14s
Linter	4m 21s
E2E tests (macos-latest)	7m 40s
	47m 12s

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