Restructured error management in BackendAccess; Introduced BackendMoo… #1765

Job	Run time
build (AuthoringToolTest)	3m 26s
test-platforms (ubuntu-22.04)	1m 41s
build (BackendAccessTest)	3m 0s
test-platforms (ubuntu-20.04)	1m 26s
build (BusinessLogicTest)	3m 16s
test-platforms (windows-latest)	4m 47s
build (DataAccessTest)	3m 39s
build (GeneratorTest)	3m 21s
build (IntegrationTest)	3m 15s
test-platforms (macos-latest)	1m 32s
build (PresentationTest)	2m 15s
build (SharedTest)	3m 8s
finish	7s
send-summary	2s
	34m 55s

Provide feedback