fix: ensure JSON files respect .rooignore during indexing #13300

Job	Run time
check-translations	37s
knip	42s
compile	1m 53s
platform-unit-test (windows-latest)	3m 45s
platform-unit-test (ubuntu-latest)	3m 40s
check-openrouter-api-key	3s
integration-test	7m 18s
notify-slack-on-failure	0s
	17m 58s

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