Allow to use FF to configure /builds folder

Kamil Trzcińskirequested to merge
add-ff-for-builds-dir into master

What does this MR do?

Adds a FF to allow to fallback to previous behavior of /builds folder for docker where we would cache /builds/group instead of /builds as of %11.10.

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Added tests for this feature/bug
  • In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

Help with #4174 (comment 161996599)

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