TestViewer: Better search and other minor tweaks

[chausner]

Description

This applies a number of minor improvements and tweaks to the unit tests viewer:

• Made the drawer width a bit larger so that most of the test component names are no longer cut off
• Use MudNavMenu for the list, it looks more polished than the raw MudList
• Change the search behavior to also find test components by substrings, e.g. typing "chart" will now also find "LineChartWithBigValuesTests". Before it would search by prefix only.
• A couple of other minor tweaks/refactorings.

How Has This Been Tested?

Tested all changes manually.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4cf042d) 90.62% compared to head (7400ab6) 90.63%.
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #7353   +/-   ##
=======================================
  Coverage   90.62%   90.63%           
=======================================
  Files         427      427           
  Lines       15174    15182    +8     
=======================================
+ Hits        13752    13760    +8     
  Misses       1422     1422           

see 1 file with indirect coverage changes

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[chausner]

@henon Would be nice to have someone review these changes. :)

[henon]

LGTM, thanks a lot.