refactor: Remove Watson translate engine

[andreichirila0712]

Summary

This PR removes the Watson translation engine as it's no longer supported/needed.

Changes

• Deleted the WATSON enum constant from Type.java.
• Removed the file associated with the Watson translation engine.
• Fixed a typo in getMtTest method name.

Testing

• No new tests were added since this PR removes an unsupported feature.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.14%. Comparing base (5ab9f0c) to head (928629f).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #311   +/-   ##
=========================================
  Coverage     94.14%   94.14%           
  Complexity      810      810           
=========================================
  Files           190      190           
  Lines          2729     2729           
  Branches         54       54           
=========================================
  Hits           2569     2569           
  Misses          134      134           
  Partials         26       26           

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[andrii-bodnar]

@andreichirila0712 thank you!