database: report connection failure in _mysql_connect() #4727

Job	Run time
apps-build-release	1m 39s
libs-build	1m 58s
apps-x86-build-release	1m 31s
client-build	2m 31s
apps-arm64-build-release	6m 47s
apps-build	2m 18s
libs-vcpkg-build	2m 49s
client-vcpkg-build	3m 0s
apps-vcpkg-build	4m 2s
libs-cmake-build	1m 55s
libs-arm64-build	1m 49s
apps-arm64-build	7m 53s
manager-with-webview-vcpkg-build	12m 53s
server-build	4m 21s
manager-with-webview-build	5m 51s
manager-without-webview-build	6m 48s
unit-test-build	3m 12s
integration-test-build	5m 41s
	1h 16m 58s

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