fix(db): split referral_legacy migration to handle PostgreSQL enum li… #5710

Job	Run time
build-and-check	2m 50s
test-integration-packages/internal	1m 1s
test-integration-cli	39s
test-integration-packages/billing	1m 3s
test-integration-web	38s
test-common	44s
test-integration-common	47s
test-integration-sdk	50s
test-.agents	45s
test-cli	49s
test-packages/agent-runtime	46s
test-packages/billing	37s
test-web	42s
test-packages/internal	43s
test-sdk	44s
test-integration-packages/agent-runtime	47s
	14m 25s

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