Cherry-pick gh-2845: update class var parameter to use Map interface (#2846)

[t92549]

Co-authored-by: t92549 80890692+t92549@users.noreply.github.com

Related Issue

• Resolve Cherry-pick gh-2845: update class var parameter to use Map interface (#2846) #2857

[codecov-commenter]

Codecov Report

Merging #2857 (8a2b3b8) into v2-alpha (8015440) will increase coverage by 0.01%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             v2-alpha    #2857      +/-   ##
==============================================
+ Coverage       56.45%   56.46%   +0.01%     
- Complexity       2499     2501       +2     
==============================================
  Files             917      917              
  Lines           32409    32409              
  Branches         3325     3325              
==============================================
+ Hits            18297    18301       +4     
+ Misses          12723    12721       -2     
+ Partials         1389     1387       -2     

Impacted Files	Coverage Δ
...ov/gchq/gaffer/named/operation/NamedOperation.java	72.50% <ø> (ø)
...onutil/iterable/LimitedInMemorySortedIterable.java	52.00% <0.00%> (+2.66%)	⬆️
.../java/uk/gov/gchq/gaffer/commonutil/OneOrMore.java	74.32% <0.00%> (+2.70%)	⬆️

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