Remove project import data on failure

What does this MR do and why?

Since we don't have retry functionality for imports. Let's consider removing import data when the import failed

Feature flag: remove_import_data_on_failure

Related issue: #18388 (closed)

For example:

Github

The import data would be rebuilt if import is unsuccessful

Repo by URL

It inserts user/password in the import-url and takes it from there (doesn't need import data for retry)