Major projects cannot be submitted with the same name and repeated skills

Trying to resubmit a project with the same name and skills (a somewhat normal occurrence) fails due to how the creation of skills with MP ids work, which should be reworked so this does not happen.

(the problem child)
https://github.com/ComputerScienceHouse/conditional/blob/ebf825cdfabf89eec920d7e8173ec1070ce3d5c4/conditional/blueprints/major_project_submission.py#L125-L128

從 conditional/blueprints/major_project_submission.py 的第 125-128 行開始，然後重現提交一個名稱相同且包含重複 skills 的 major project。追蹤如何使用 major-project IDs 建立 skills；當重新提交成功且不會因為這些既有的 skills 而失敗時，即表示完成。

由索引模型根據 Issue 內容生成。