feat(billing): Convert referral bonuses from monthly recurring to one-time credits, and bump them from 250 -> 500 #5701

Job	Run time
build-and-check	3m 0s
test-integration-sdk	47s
test-integration-packages/billing	1m 9s
test-integration-packages/agent-runtime	40s
test-packages/internal	44s
test-common	47s
test-packages/agent-runtime	41s
test-integration-web	39s
test-integration-common	38s
test-.agents	47s
test-integration-cli	43s
test-packages/billing	1m 1s
test-cli	54s
test-sdk	41s
test-integration-packages/internal	1m 14s
test-web	1m 16s
	15m 41s

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