Postgresql flexible server db API should return useful/valid error message when collation is unexpected

After tested, seems Postgresql flexible server db API always returns below useless error message when collation is unexpected. So maybe the API error message has to be refined for troubleshooting. So could you help take a look and fix this issue? Thanks in advance.

Error message:
```
Code="InternalServerError" Message="An unexpected error occured while processing the request. Tracking ID: 'xxxxx-xxxx-xxxx-xxxx-xxxxx'"
```

No file, test, or specific API operation is named. Start by locating the PostgreSQL flexible server database API path that handles an unexpected collation and reproduce the reported InternalServerError; done means the API returns a useful, valid troubleshooting message for that case.

Written by the indexing model from the issue text.