Draft: POC Fix update_template rake task

What does this MR do and why?

Fix update_template rake task

Praefect does not create .git files anymore. See internal discussion.

So this MR changes the URL to connect through http(s):// instead of file://.

For this, the user will have to specify GL_USERNAME and GL_PASSWORD to execute the rake task. For example,

GL_USERNAME=root GL_PASSWORD="5iveL!fe" bundle exec rake gitlab:update_project_templates\[cluster_management\]

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