Autocomplete: Treat all ways of closing overlay the same

[danielchalmers]

Description

Previously if you would click the overlay it would trigger the menu close handler, but not if you tabbed away or set it programmatically.
Now we listen to the overlay, so any event that makes that close will call our close handler.

Resolves #3825
Resolves #3824

How Has This Been Tested?

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)

Before (tabbing away does not coerce but clicking does):

video3.mp4

After (both tabbing away and clicking coerces):

video2.mp4

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 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 90.22%. Comparing base (28bc599) to head (d515bef).
Report is 170 commits behind head on dev.

Files	Patch %	Lines
...r/Components/Autocomplete/MudAutocomplete.razor.cs	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8914      +/-   ##
==========================================
+ Coverage   89.82%   90.22%   +0.39%     
==========================================
  Files         412      424      +12     
  Lines       11878    12283     +405     
  Branches     2364     2411      +47     
==========================================
+ Hits        10670    11082     +412     
+ Misses        681      670      -11     
- Partials      527      531       +4     

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[danielchalmers]

@henon done but there's like a dozen other methods that are missing Async including the public Clear. I think these should be done in a separate PR