Stability fixes

[helto4real]

Breaking change

Proposed change

Some quality and stability fixes.

• Make the dispose of application context thread safe
• Correct sample of use calendar in debug project
• Make the handling of usage of cancellation token that could potentially be used from a disposed or canceled Cancellation token source, check screenshot

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 #
• 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
• The code compiles without warnings (code quality check)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration are added/changed:

• Documentation added/updated for http://netdaemon.xtz

[codecov]

Codecov Report

Attention: Patch coverage is 78.78788% with 14 lines in your changes missing coverage. Please review.

Project coverage is 81%. Comparing base (089f848) to head (53bafb5).
Report is 1 commits behind head on main.

Files	Patch %	Lines
....Extensions.MqttEntityManager/MessageSubscriber.cs	0%	7 Missing ⚠️
...aemon.Extensions.Scheduling/DisposableScheduler.cs	78%	0 Missing and 4 partials ⚠️
...Deamon.HassModel/Internal/BackgroundTaskTracker.cs	66%	3 Missing ⚠️

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #1131   +/-   ##
====================================
  Coverage    81%     81%           
====================================
  Files       191     190    -1     
  Lines      3865    3887   +22     
  Branches    464     474   +10     
====================================
+ Hits       3163    3187   +24     
+ Misses      520     518    -2     
  Partials    182     182           

Flag	Coverage Δ
unittests	81% <78%> (+<1%)	⬆️

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