Some unusedVariiable cppckeck error removals.

[jhaigh0]

Description of work

Just chipping away at the cppcheck backlog.
I have looked at the history for each of these cases to check their usage was not removed in error. In all cases they were either added and never used, or had their usage removed intentionally but the definition left behind my mistake.

Also, some other ccpcheck suppressions were disrupted, so i've fixed those too.

There is no associated issue.

To test:

• ci passes
• check I haven't done anything stupid

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[robertapplin]

I can confirm these changes look good. Its nice to see a bunch of unused code being removed!