MudSelect: Change Visibility of "_currentIcon" to Internal

[jperson2000]

Description

This breaking change is proposed for V8, to change the visibility of MudSelect._currentIcon from public to internal. This member appears to be for internal use by the component.

How Has This Been Tested?

This was tested by running all unit tests to ensure they still complete properly after the change. Also, the "Select All" MudSelect example was tested, which exercises the _currentIcon property (for the "Select All" icon).

Type 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)
• Documentation (fix or improvement to the website or code docs)

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 91.54%. Comparing base (25ea55f) to head (0e9a029).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #10451   +/-   ##
=======================================
  Coverage   91.53%   91.54%           
=======================================
  Files         418      418           
  Lines       13228    13228           
  Branches     2539     2539           
=======================================
+ Hits        12108    12109    +1     
  Misses        547      547           
+ Partials      573      572    -1     

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[henon]

Added to v8.0.0 Migration Guide
#9953