feat(billing): Convert referral bonuses from monthly recurring to one-time credits, and bump them from 250 -> 500 #5578

Job	Run time
build-and-check	2m 38s
test-integration-packages/billing	1m 31s
test-integration-packages/agent-runtime	41s
test-integration-common	42s
test-integration-packages/internal	1m 4s
test-integration-cli	48s
test-packages/billing	43s
test-integration-web	41s
test-cli	1m 12s
test-packages/internal	55s
test-common	47s
test-integration-sdk	40s
test-.agents	38s
test-sdk	48s
test-web	52s
test-packages/agent-runtime	56s
	15m 36s

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