MudOverlay: Await OnClick event

[BieleckiLtd]

Closes #6152

Description

How Has This Been Tested?

unit test

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

Base: 91.52% // Head: 91.46% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (2dfa0db) compared to base (73ea3e9).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6153      +/-   ##
==========================================
- Coverage   91.52%   91.46%   -0.06%     
==========================================
  Files         383      383              
  Lines       15020    15027       +7     
==========================================
- Hits        13747    13745       -2     
- Misses       1273     1282       +9     

Impacted Files	Coverage Δ
src/MudBlazor/Components/Overlay/MudOverlay.razor	100.00% <ø> (ø)
...c/MudBlazor/Components/Overlay/MudOverlay.razor.cs	97.22% <100.00%> (+2.77%)	⬆️
...rc/MudBlazor/Components/Table/MudTFootRow.razor.cs	75.00% <0.00%> (-19.74%)	⬇️
src/MudBlazor/Components/Table/MudTr.razor.cs	84.84% <0.00%> (-9.10%)	⬇️
src/MudBlazor/Components/Table/MudTable.razor.cs	85.64% <0.00%> (-0.30%)	⬇️
src/MudBlazor/Components/Table/TableContext.cs	98.76% <0.00%> (ø)
.../MudBlazor/Components/Table/MudTableGroupRow.razor	100.00% <0.00%> (ø)
...dBlazor/Components/Table/MudTableGroupRow.razor.cs	92.50% <0.00%> (+0.19%)	⬆️
...rc/MudBlazor/Components/Table/MudTHeadRow.razor.cs	95.00% <0.00%> (+0.26%)	⬆️
src/MudBlazor/Components/Table/MudTable.razor	97.10% <0.00%> (+0.28%)	⬆️
... and 1 more

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[henon]

Thanks!