Add Gravity API key button guidance #6334

Job	Run time
build-and-check	3m 19s
test-integration-packages/billing	1m 9s
test-integration-packages/internal	1m 12s
test-integration-packages/agent-runtime	52s
test-integration-common	40s
test-packages/agent-runtime	50s
test-integration-cli	52s
test-integration-sdk	1m 21s
test-cli	1m 3s
test-.agents	48s
test-integration-web	44s
test-packages/internal	47s
test-packages/billing	52s
test-common	46s
test-web	1m 14s
test-sdk	45s
	17m 14s

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