Update credit grant priority so that referrals come before ads #5569

Job	Run time
build-and-check	2m 33s
test-integration-packages/internal	1m 10s
test-integration-packages/billing	1m 0s
test-integration-packages/agent-runtime	47s
test-integration-web	42s
test-integration-sdk	40s
test-integration-cli	43s
test-integration-common	40s
test-.agents	41s
test-packages/billing	39s
test-packages/internal	44s
test-packages/agent-runtime	52s
test-common	41s
test-sdk	48s
test-web	45s
test-cli	1m 9s
	14m 34s

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