subscription: Delete change subscription route, which is unused #5788

Job	Run time
build-and-check	2m 53s
test-integration-packages/internal	1m 8s
test-integration-packages/billing	1m 2s
test-integration-web	44s
test-integration-cli	42s
test-integration-sdk	43s
test-integration-common	48s
test-packages/internal	53s
test-integration-packages/agent-runtime	39s
test-common	38s
test-packages/agent-runtime	45s
test-sdk	41s
test-packages/billing	42s
test-cli	52s
test-web	48s
test-.agents	39s
	14m 37s

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