feat: standardize tree-sitter test implementations (#2960) #5960

Job	Run time
compile	1m 15s
knip	49s
check-translations	51s
check-openrouter-api-key	1s
test-extension (ubuntu-latest)	2m 33s
test-webview (ubuntu-latest)	1m 30s
test-extension (windows-latest)	4m 32s
test-webview (windows-latest)	2m 47s
integration-test	2m 31s
unit-test	1s
	16m 50s

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