Revert "#2656 Fix for - Session is not provided by ClearChangeMasks w…

[mregen]

Proposed changes

…hen a change is notified (#2772)"
This reverts commit 9c7b321.

During tests the new code ran into an ArgumentNullException creating a new OperationContext.
Even with more checks I have performance concerns about the copy of the servicecontext and the new OperationContext for every data change, it may affect the server perf. We need to find a better solution.

Related Issues

• Revert #2656 Fix for - Session is not provided by ClearChangeMasks when a change is notified #2772

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.93%. Comparing base (9c7b321) to head (492f2b2).

Files with missing lines	Patch %	Lines
...braries/Opc.Ua.Server/Diagnostics/MonitoredNode.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2792      +/-   ##
==========================================
- Coverage   55.40%   54.93%   -0.48%     
==========================================
  Files         349      349              
  Lines       66055    66049       -6     
  Branches    13549    13547       -2     
==========================================
- Hits        36597    36282     -315     
- Misses      25572    25837     +265     
- Partials     3886     3930      +44     

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