feat: Add configurable embedding batch size for code indexing #13995

Job	Run time
check-translations	33s
knip	43s
platform-unit-test (ubuntu-latest)	3m 38s
compile	2m 0s
check-openrouter-api-key	4s
platform-unit-test (windows-latest)	6m 42s
integration-test	9m 30s
notify-slack-on-failure	0s
	23m 10s

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