MudThemeProvider: Only wrap multi-word font names in quotes in CSS font-family declarations

[Garderoben]

Description

Currently MudBlazor adds quotations around every font name in the font family, this works for everything except the generic family names that is often used as fallbacks.

Example, this would still display Roboto as font: 'sans-serif', 'Roboto'

This can be solved in different ways, one would be to have a list of all generic/system fonts and then skip the wraps for this font but then we would need to keep that list updated etc, another way would be to change the MudTheme's FontFamily Array to just a string but that would be a breaking change, and i prefer the array way.

I chose to only wrap the font name with quotes if the font name is more than one word, this automatically fixes the issue since the generic family names uses - rather than spaces.

Before: 'Public Sans', 'Roboto', 'Arial', 'sans-serif'
After: 'Public Sans', Roboto, Arial, sans-serif

This change does not technically break anything but rather fix the broken behavior, however if someone would have configured there theme to something like this (unlikly) 'sans-serif', 'Roboto' then it will now display sans-serif instead of Roboto.

fixes #5606

How Has This Been Tested?

visually, manually

Type of Changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

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

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.08%. Comparing base (be80b02) to head (74ffeb5).
Report is 4 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #11214   +/-   ##
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  Coverage   91.08%   91.08%           
=======================================
  Files         436      436           
  Lines       14143    14144    +1     
  Branches     2731     2731           
=======================================
+ Hits        12882    12883    +1     
  Misses        639      639           
  Partials      622      622           

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