Add project import usage pings

- Add usage pings for Project Imports of
  gitlab, gitea, bitbucket server and cloud, manifest
  git types

ee/changelogs/unreleased/georgekoltsov-add-importing-projects-usage-ping.yml

+---
+title: Add usage pings for project import using various importers (GitLab, Bitbucket, Gitea, GitHub and more)
+merge_request: 40130
+author:
+type: added