Expose name property in imports API

What does this MR do?

Exposes the name property in the import API to allow a user of the API to explicitly set a project name for a newly imported project. name will be optional so the import API will still default to using the path as the project name if name isn't provided in the request.

related to #13698

It seems like it would be an easier experience for someone using the API to be able to just add name to the request parameter instead of through the override_params. This change also somewhat mimics the functionality of the projects API when creating a new project where a user is allowed to specify a name or a path when creating a project.

original CE MR: gitlab-foss!32886 (closed)

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Does this MR meet the acceptance criteria?

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• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
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