[RTADPA BW TESTS] Fix Moore_spruce_latest_bandwidth test

Fix the construction of the yaml config file for the sprucing job, and make sure the job tries to download it from the right place. To test the construction of the config I ran the HLT2 step locally, which produces a yaml that looks correct, then copied that into the directory where the sprucing test is ran and observed that the sprucing test is now all OK - this is a rough emulation of what the test does on the LHCbPR machine.

Also remove an obviated test script and step.

• Needs re-testing again as I fixed it locally before Christmas.