feat: add Tetrate Agent Router Service (TARS) as provider #14744

Job	Run time
knip	50s
check-translations	39s
compile	2m 7s
platform-unit-test (windows-latest)	3m 50s
platform-unit-test (ubuntu-latest)	3m 43s
check-openrouter-api-key	2s
integration-test	0s
notify-slack-on-failure	0s
	11m 11s

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