deprecate checkConnection #4043

Job	Run time
build-and-check	2m 57s
test-backend	46s
test-packages/agent-runtime	50s
test-.agents	46s
test-web	40s
test-cli	50s
test-npm-app	52s
test-integration-backend	44s
test-integration-.agents	45s
test-integration-cli	41s
test-integration-npm-app	42s
test-common	41s
test-integration-packages/agent-runtime	45s
test-integration-common	44s
test-integration-web	44s
	13m 27s

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