refactor(vector-search): run the existing-keys probe only on the crea… #7357

Job	Run time
lint / ESLint	51s
changes	8s
should-run	4s
docker-build / Docker Build	5m 26s
type-check / tsc baselines	2m 48s
frontend-tests / Frontend tests	19m 10s
backend-tests	0s
backend-tests-coverage	0s
integration-tests	0s
integration-tests-coverage	0s
clean / Clean deployments	6s
frontend-tests-coverage / Unit tests coverage	22s
Remove artifacts	-1s
frontend-tests-coverage / Integration tests coverage	-1s
	28m 53s

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