feat: add Gemini free tier models with -free aliases #14434

Job	Run time
knip	42s
check-translations	41s
compile	2m 2s
platform-unit-test (ubuntu-latest)	3m 50s
check-openrouter-api-key	2s
platform-unit-test (windows-latest)	5m 6s
integration-test	0s
notify-slack-on-failure	0s
	12m 23s

Provide feedback