Fixing issue of ambiguous/duplicate knowledge triplet generation because of...

Fixing issue of ambiguous/duplicate knowledge triplet generation because of mismatched case or appended special character (double quotes) in generated entities (subject, predicate, object) (#10409)

* While generating triplets, many ambiguous duplicates are created becuase of mismatch in case or presence of double quote charaters appended to the subject or the object. A line of code which strips double qoutes and Capitalizes the entities helps in disambiguation

* Format code with black

* Updated test_base.py with expected output for capitalized text

* Revert "Format code with black"

This reverts commit dd87dc46d7d7630e5bb611a469d6ec14f2e2e194.

* Fix end of files

* Remove unnecessary files