MudTabPanel: Add Visible property

[Apflkuacha]

Description

I added a visible property for the MudTabPanel and also extended a example in the doku. I thought I extend an existing example as one example per property is not very intuitive. That fixes #10722

How Has This Been Tested?

visually
if a UnitTest is necessary I would need the information which UnitTest I could extend or copy and adapt.

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.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.86%. Comparing base (13a89f8) to head (4c0f938).
Report is 16 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/MudBlazor/Components/Tabs/MudTabPanel.razor.cs	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10797      +/-   ##
==========================================
+ Coverage   91.83%   91.86%   +0.02%     
==========================================
  Files         427      427              
  Lines       13430    13454      +24     
  Branches     2592     2596       +4     
==========================================
+ Hits        12334    12359      +25     
  Misses        523      523              
+ Partials      573      572       -1     

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[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

[danielchalmers]

Thanks @Apflkuacha, tweaked a few things and merging it now!

[Apflkuacha]

@ScarletKuro This pull request is included in the new 8.3 release, but not mentioned in the Release notes, should probably be in the New Features section. Just to increase my knowledge: are the release notes created by someone using compare/v8.2.0...v8.3.0 and not created by some automation?

[ScarletKuro]

It's auto, but when it has the label 'docs,' it's excluded from release. When you're making a feature request, you don't select 'documentation' under the type of change, since it usually goes without saying for new features. We only select it when it's a pure documentation change.