Fixed uploading a skeleton template in configurator

Import Userrequested to merge
bs/fixed_skeleton_upload into develop

Motivation and context

Resolved #8592 (closed)

How has this been tested?

Checklist

  • I submit my changes into the develop branch
  • I have created a changelog fragment
  • I have updated the documentation accordingly
  • I have added tests to cover my changes
  • I have linked related issues (see GitHub docs)
  • I have increased versions of npm packages if it is necessary (cvat-canvas, cvat-core, cvat-data and cvat-ui)

License

  • I submit my code changes under the same MIT License that covers the project. Feel free to contact the maintainers if that's a concern.

Summary by CodeRabbit

  • Bug Fixes

    • Resolved an issue with uploading skeleton templates in the configurator.
    • Enhanced error handling for SVG uploads, providing clearer error messages and ensuring valid SVG structure.

  • Improvements

    • Improved the robustness of SVG upload functionality and validation process, leading to a more reliable skeleton configuration setup.

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