Remove cppcheck suppressions to generate the useful output

[thomashampson]

Description of work

Reference build to use to help with the cppcheck hackathon.

https://builds.mantidproject.org/job/pull_requests-cppcheck/62983/

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[github-actions]

👋 Hi, @thomashampson,

Conflicts have been detected against the base branch. Please rebase your branch against the base branch.

[sf1919]

Once #38746 #38744 and #38716 have been resolved this PR can be closed.