#1086 - enable custom logos to be larger than 24px

[louise-davies]

Description

Instead, we just set a sensible max height based off of the app bar height. Default logos I set to be 24px height instead so we don't have to modify the SVGs to be smaller.

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage

Agile board tracking

Closes #1086

[codecov]

Codecov Report

Merging #1090 (224b313) into develop (9d5c7a5) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1090      +/-   ##
===========================================
+ Coverage    97.95%   97.97%   +0.01%     
===========================================
  Files           42       42              
  Lines         1565     1577      +12     
  Branches       420      423       +3     
===========================================
+ Hits          1533     1545      +12     
  Misses          31       31              
  Partials         1        1              

Impacted Files	Coverage Δ
src/mainAppBar/mainAppBar.component.tsx	100.00% <100.00%> (ø)
src/state/scigateway.types.tsx	100.00% <0.00%> (ø)
src/state/reducers/scigateway.reducer.tsx	100.00% <0.00%> (ø)
src/state/middleware/scigateway.middleware.tsx	93.23% <0.00%> (ø)
src/state/actions/scigateway.actions.tsx	98.18% <0.00%> (+0.03%)	⬆️
src/theming.tsx	97.05% <0.00%> (+0.39%)	⬆️

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