Remove more obsoletes

[danielchalmers]

Description

How Has This Been Tested?

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

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.77%. Comparing base (e6741bb) to head (4ee7158).
Report is 4 commits behind head on dev.

Files	Patch %	Lines
...MudBlazor/Components/Carousel/MudCarousel.razor.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8568      +/-   ##
==========================================
+ Coverage   89.52%   89.77%   +0.25%     
==========================================
  Files         411      411              
  Lines       11848    11817      -31     
  Branches     2362     2362              
==========================================
+ Hits        10607    10609       +2     
+ Misses        713      681      -32     
+ Partials      528      527       -1     

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[ScarletKuro]

Added to v7.0.0 Migration Guide #8447