feat(billing): Convert referral bonuses from monthly recurring to one-time credits, and bump them from 250 -> 500 #5706

Job	Run time
build-and-check	2m 45s
test-integration-packages/internal	1m 14s
test-integration-packages/billing	1m 1s
test-integration-packages/agent-runtime	48s
test-integration-common	40s
test-integration-sdk	50s
test-.agents	39s
test-integration-web	40s
test-packages/internal	54s
test-integration-cli	43s
test-cli	49s
test-packages/agent-runtime	42s
test-web	44s
test-packages/billing	1m 4s
test-common	48s
test-sdk	41s
	15m 2s

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