Preview load to determine if class is production no longer overwrites class

[isc-pbarton]

Fixes #830

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.00%. Comparing base (8aa09fd) to head (8e99a1a).

Files with missing lines	Patch %	Lines
cls/SourceControl/Git/Production.cls	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #834   +/-   ##
=======================================
  Coverage   49.00%   49.00%           
=======================================
  Files          24       24           
  Lines        3269     3269           
=======================================
  Hits         1602     1602           
  Misses       1667     1667           

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[isc-pbarton]

Testing steps:
In a namespace configured with a Git repository, create a new class pbarton.test830

Class pbarton.test830 Extends Ens.BusinessProcess
{

Method OnRequest(request As %Library.Persistent, Output response As %RegisteredObject) As %Status
{
}

Storage Default
{
<Type>%Storage.Persistent</Type>
}

}

Save and compile the class. It should fail to compile.
Change the method spec to this:

Method OnRequest(request As %Library.Persistent, Output response As %Library.Persistent) As %Status

Save and compile the class. It should compile successfully.

Previous to this fix, saving the class would reset the method spec to the previous broken state.