Test

Restore stealth plugin and fix fetcher language configuration #3625

Job	Run time
validate_metadata (windows-latest, 20)	1m 30s
test (windows-latest, 20)	5m 25s
test (ubuntu-22.04, 24)	2m 58s
validate_metadata (ubuntu-22.04, 24)	48s
validate_declarations (ubuntu-22.04, 24)	47s
validate_declarations (windows-latest, 20)	1m 21s
test (ubuntu-22.04, 20)	3m 0s
test (macos-latest, 20)	3m 29s
validate_declarations (ubuntu-22.04, 20)	48s
validate_declarations (macos-latest, 20)	1m 4s
validate_metadata (macos-latest, 20)	50s
validate_metadata (ubuntu-22.04, 20)	40s
	22m 40s

Provide feedback