Added pull event handler for full import

[isc-pbarton]

Resolves #619

FullLoad handler will call Import All with Force. Import All handles deletes by deleting any items that exist in the Embedded Git timestamp cache but do not exist in the Git repository. I think that is the level of smartness for deletes we want in this case: if an item was deployed or edited with Embedded Git, it will get deleted properly; if it exists on the server for some other reason, it will not get deleted.

Changes here got tangled up with #469, so I'm going to mark this as a draft until production decomposition is merged and then rebase it onto main.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 41.81%. Comparing base (ebf933e) to head (09c839a).

Files with missing lines	Patch %	Lines
cls/SourceControl/Git/Utils.cls	0.00%	5 Missing ⚠️
...ls/SourceControl/Git/PullEventHandler/FullLoad.cls	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #638      +/-   ##
==========================================
- Coverage   41.84%   41.81%   -0.03%     
==========================================
  Files          22       23       +1     
  Lines        3016     3018       +2     
==========================================
  Hits         1262     1262              
- Misses       1754     1756       +2     

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