fix: test cases mlflow registry

[yleilawang]

There existed errors in test logs while test cases still passed. One example is the ConnectionError due to not mocking mlflow function calls properly.

Fixed through modifying a few syntax for patch mock calls. The test cases should pass with no logging errors now.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.16%. Comparing base (f6ce546) to head (1d5cbbc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #415 +/- ## ========================================== - Coverage 92.18% 92.16% -0.02% ========================================== Files 97 97 Lines 4775 4776 +1 Branches 429 429 ========================================== Hits 4402 4402 Misses 276 276 - Partials 97 98 +1 ```

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