feat(billing): Convert referral bonuses from monthly recurring to one-time credits, and bump them from 250 -> 500 #5707

Job	Run time
build-and-check	2m 52s
test-integration-packages/internal	1m 3s
test-integration-packages/billing	1m 6s
test-integration-common	45s
test-integration-sdk	42s
test-integration-packages/agent-runtime	39s
test-integration-web	40s
test-integration-cli	45s
test-sdk	50s
test-packages/agent-runtime	1m 17s
test-cli	53s
test-packages/billing	43s
test-common	56s
test-packages/internal	51s
test-web	49s
test-.agents	39s
	15m 30s

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