fix(event_handler): hide error details by default

[rubenfonseca]

Issue number: #3405

Summary

Changes

Please provide a summary of what's being changed

This PR simplifies the default format for data validation errors, exposing just the location (field name) and the type of error.

User experience

Please share what the user experience looks like before and after this change

This code:

@app.get("/claims")
def claims() -> Dict[str, Any]:
    return "oh no, this is not a dict"  # type: ignore

Now returns the following payload:

{
	"statusCode": 422,
	"detail": [{"loc": ["response"], "type": "dict_type"}]
}

Checklist

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• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (365c2dc) 95.41% compared to head (49fc5c7) 95.39%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3406      +/-   ##
===========================================
- Coverage    95.41%   95.39%   -0.03%     
===========================================
  Files          209      209              
  Lines         9647     9648       +1     
  Branches      1769      809     -960     
===========================================
- Hits          9205     9204       -1     
- Misses         329      330       +1     
- Partials       113      114       +1     

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