Rename .agents-graveyard to agents-graveyard #5468

Job	Run time
build-and-check	2m 19s
test-integration-common	39s
test-integration-packages/billing	45s
test-integration-packages/agent-runtime	39s
test-integration-cli	36s
test-integration-.agents	38s
test-integration-packages/internal	46s
test-integration-sdk	44s
test-integration-web	40s
test-cli	1m 17s
test-common	46s
test-.agents	46s
test-packages/internal	51s
test-packages/agent-runtime	54s
test-packages/billing	39s
test-sdk	43s
test-web	43s
	14m 25s

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