Fix serialization of objects in custom map section of payoad.

[diegov]

Description of the change

Fix issue when serializing object in custom map.

We were wrapping the string representation of the objects in quotes, without accounting for any quotes already present in the string.

Now we simply use our existing string serialization method which correctly escapes the string contents as necessary.

Type of change

• [X] Bug fix (non-breaking change that fixes an issue)
• [ ] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

[ch83833]

Checklists

Development

• [x] Lint rules pass locally
• [x] The code changed/added as part of this pull request has been covered with tests
• [x] All tests related to the changed code pass in development

Code review

• [ ] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• [x] "Ready for review" label attached to the PR and reviewers mentioned in a comment
• [ ] Changes have been reviewed by at least one other engineer
• [ ] Issue from task tracker has a link to this pull request

[shortcut-integration[bot]]

This pull request has been linked to Clubhouse Story #83833: [L3/SEV3] JAVA SDK - Customer experienceing com.rollbar.notifier.sender.exception.ApiException: could not parse json.