Move user provided extra data under custom

[arpad-fulop-rb]

Description of the change

custom is a better place for user provided extra_data, since custom is where users can put data interesting to them. However, custom is not to be filled by the SDK, so some SDK generated fields that are also filled using extra_data (in logger.py) should not be moved under custom.

Type of change

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

Related issues

Shortcut stories and GitHub issues (delete irrelevant)

• Fix [SC-127161]

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

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

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #127161: Release new beta version of pyrollbar that puts extra_data under custom.

[waltjones]

Merged main branch to pick up CI changes.