This Commit fixes failing system tests in ISIS powder polaris.

re: #28415

This commit adds the changes to the release notes for the changes to rebinning in polaris create pdf. It also adds the changes to the script documentation.

This commit adds release notes detailing the change of output names from Polaris.create_total_scattering_pdf

re: #28414

Signed-off-by: Steven Hahn <hahnse@ornl.gov>

Skips any missing ws spectra whilst masking. This can happen if a user
crops to a component, causing sepctra gaps between banks.
We now filter any spectrum numbers not in the WS and emit a warning to
the user when this happens

Adds a new API to getSpectrumNumbers from a Matrix workspace. This was
implemented as a indirect call to IndexInfo rather than exposing
IndexInfo, since there are few other things a user could want to call