BitBucket import should use URL slug for project path
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=354793) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=354793) </details> <!--IssueSummary end--> ### Proposal The Bitbucket import page currently uses the repository's human-friendly name (e.g. "Example Repo") to pre-fill the project path field, but this field is used for the URL slug, and thus only supports url-friendly characters. This makes the pre-filling useless in most cases - it would be more useful to pre-fill with the URL slug that Bitbucket uses (e.g. `example-repo`), if available. Importing the project failed: This namespace has already been taken! Please choose another one. <!-- Label reminders Use the following resources to find the appropriate labels: - https://gitlab.com/gitlab-org/gitlab/-/labels - https://about.gitlab.com/handbook/product/categories/features/ -->
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