Update Realm Management OpenAPI

[szakhlypa]

• fix TriggerDeliveryPolicyErrorHandler schema
• add explicit 404 errors

[codecov[bot]]

Codecov Report

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

Project coverage is 62.25%. Comparing base (7d97daa) to head (20233b7). Report is 41 commits behind head on release-1.1.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-1.1 #942 +/- ## =============================================== - Coverage 68.35% 62.25% -6.11% =============================================== Files 274 193 -81 Lines 7069 4726 -2343 =============================================== - Hits 4832 2942 -1890 + Misses 2237 1784 -453 ```

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