Vendored templates are too large for repo

Problem to solve

Project Templates (https://gitlab.com/gitlab-org/gitlab-ce/issues/32420) right now work by cloning an exported project from https://gitlab.com/gitlab-org/gitlab-ce/tree/master/vendor/project_templates. These can be large and it is inefficient to store compressed files in a git repo.

Upon completion it would be good to prune the history of these files from the repo.

Target audience

Internal

Further details

N/A

Proposal

Identify a way to include/bundle these without storing them in git.

What does success look like, and how can we measure that?

Repository is smaller.

Links / references

cc @brendan