fix(parser): fix EventBridgeModel when working with scheduled events

[leandrodamascena]

Issue number: #6112

Summary

Changes

This PR improves EventBridge Scheduler payload validation. It converts "{}" strings to empty dictionaries for AWS Scheduler events. This change prevents parsing errors and enhances event processing reliability, especially for events with empty payloads.

User experience

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

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]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.19%. Comparing base (240177d) to head (e6cd557).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6134   +/-   ##
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  Coverage    96.19%   96.19%           
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  Files          235      235           
  Lines        11226    11229    +3     
  Branches       828      828           
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+ Hits         10799    10802    +3     
  Misses         337      337           
  Partials        90       90           

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