feat(billing): Convert referral bonuses from monthly recurring to one-time credits, and bump them from 250 -> 500 #5703

Job	Run time
build-and-check	2m 48s
test-integration-sdk	41s
test-integration-cli	42s
test-integration-web	40s
test-integration-packages/internal	1m 3s
test-integration-packages/billing	1m 9s
test-integration-packages/agent-runtime	41s
test-common	48s
test-packages/billing	1m 3s
test-sdk	49s
test-integration-common	38s
test-packages/internal	48s
test-web	41s
test-.agents	47s
test-packages/agent-runtime	47s
test-cli	51s
	14m 56s

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