Introduce GIT_STRATEGY=none

What does this MR do?

Handles a new GIT_STRATEGY option, specifying that git operations are unnecessary for a particular build

Why was this MR needed?

If the git repository is not used for a particular build, the work of cloning/fetching and checking out a particular revision is wasted, and potentially expensive.

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

Closes #1723 (closed)

Closes #1588 (closed)

Related to #1296 (closed)

Alternative to !196

Alternative to !330 (closed)

Prerequisite of

Merge request reports