Rename some HeliumAnalyserEfficiency algorithm parameters

[yusufjimoh]

Description of work

Rename some HeliumAnalyserEfficiency algorithm parameters for consistency

Summary of work

• Rename some HeliumAnalyserEfficiency algorithm parameters for consistency
• Updated Unit Tests
• Moved the release note for pull request - Added spin state order handling to PolarizationCorrectionFredrikze Correction Algorithm #37672 from the v6.11 folder to the v6.12 folder.

Fixes #38290

To test:

• Follow the instructions on https://docs.mantidproject.org/nightly/algorithms/HeliumAnalyserEfficiency-v1.html
• It should work functionally (test using the script and also by running the algorithm on the GUI)
• all unit tests should pass

[rbauststfc]

Thanks for the work on this so far. Great spot on the release note that needed moving from a previous PR. I had a few comments, but this is coming along well.

[rbauststfc]

Thanks very much for all of the updates. I'm afraid that there are a couple more constants that needed to be updated for consistency with our naming conventions, so I've added comments for those below. Other than that, everything else is looking good now.

[rbauststfc]

Thanks very much for this, all of the code changes are looking good now.

I just did a final search for all instances of the old parameter names and it looks like the algorithm documentation needs to be updated. If you look in the description (https://docs.mantidproject.org/nightly/algorithms/HeliumAnalyserEfficiency-v1.html#description) then there are a couple of references to GasPressureTimesCellLength and GasPressureTimesCellLengthError that need to be updated.

[rbauststfc]

Code changes are all looking good and the algorithm documentation has also been updated to use the new constant names. This PR also moves the release notes from a previous PR that incorrectly went into the 6.11 folder into the 6.12 folder, so it's great to have that sorted out here too.