CMCL-0000: CameraDeactivated events were not sent when a blend interrupted another

[glabute]

Purpose of this PR

Bug reported on forum: https://discussions.unity.com/t/when-new-blend-occurs-first-blends-deactivated-event-is-muted/1556716

Camera deactivated events were never being sent for camera A in the situation of blending (A ->B) -> C.
We would expect to get a deactivation for A at the end of (A -> B).

Added unit test for this case.

Testing status

• Added an automated test
• Passed all automated tests
• Manually tested

Documentation status

• Updated CHANGELOG
• Updated README (if applicable)
• Commented all public classes, properties, and methods
• Updated user documentation

Technical risk

low

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Codecov Report

Attention: Patch coverage is 98.30508% with 1 line in your changes missing coverage. Please review.

Project coverage is 27.09%. Comparing base (ba4cc2b) to head (78e7097).
Report is 71 commits behind head on main.

Files with missing lines	Patch %	Lines
...machine/Runtime/Helpers/CinemachineCameraEvents.cs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1028      +/-   ##
==========================================
+ Coverage   26.97%   27.09%   +0.12%     
==========================================
  Files         254      254              
  Lines       28418    28452      +34     
==========================================
+ Hits         7665     7710      +45     
+ Misses      20753    20742      -11     

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[jmcduff-unity]

Lgtm!