Changed registry.GetDefinitions to use yield

[codecov[bot]]

Codecov Report

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

Comparison is base (1f13d00) 88.03% compared to head (29895ac) 88.03%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #602 +/- ## ======================================= Coverage 88.03% 88.03% ======================================= Files 7 7 Lines 443 443 ======================================= Hits 390 390 Misses 53 53 ```

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