Replace /referral with /refer-friends and let them copy referral url #5766

Job	Run time
build-and-check	2m 45s
test-integration-packages/internal	1m 2s
test-integration-packages/billing	1m 0s
test-integration-packages/agent-runtime	46s
test-integration-common	42s
test-packages/internal	44s
test-integration-sdk	47s
test-packages/agent-runtime	46s
test-integration-cli	39s
test-packages/billing	41s
test-.agents	38s
test-sdk	53s
test-cli	1m 38s
test-integration-web	48s
test-common	39s
test-web	51s
	15m 19s

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