stream-clone-test: add title to various test cases These case are fine as is, but as we are adding title to all the other as we simplify them, lets add title for all cases.

stream-clone-test: simplify testing of secret cloning restriction Here, we just want to check if the streaming clone is allowed and used or not. We do not care about the details of the clone itself.

stream-clone-test: simplify the background file closing test Here we just care about the fact the background file closing logic actually ran. We don't need to check the details of the cloning. The details of the output is very fragile and consume a lot of time for little value when adjusting formats, caches, and protocol. So we filter it out.