Bugfix: Adding single type will prevent loading the whole assembly

[helto4real]

Breaking change

Proposed change

Fixes bug that prevent loading specific app types and assembly. Fix by doing smarter (correct) check for allready registerd appmodel and type resolvers.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Calling AddAppFromType before AddAppsFromAssembly only discovers the app in the first call #620
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• The code compiles without warnings (code quality chek)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[codecov-commenter]

Codecov Report

Merging #627 (c7a6b01) into dev (1d70bbc) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #627   +/-   ##
=======================================
  Coverage   80.12%   80.12%           
=======================================
  Files         111      111           
  Lines        2903     2903           
  Branches      309      308    -1     
=======================================
  Hits         2326     2326           
  Misses        450      450           
  Partials      127      127           

Flag	Coverage Δ
unittests	80.12% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...el/Common/Extensions/ServiceCollectionExtension.cs	93.24% <100.00%> (ø)

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