Remove Failure category from passing test cases

Some of the test cases marked as Failure have started passing. Need to
ensure that these testcases are run on a regular basis.
Wrong category was removed

Intended to remove Failure category instead of UnitTests category.
Merge pull request #2422 from Conceptual-Design/TestCatagorization

Remove Failure category from 22 passing test cases
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into AssocLangBlockUpdate