[Analyzers][CPP] turn on Warning 4100 (#21449)

* Analyzers CPP

Changing the warning level from 3 to 4.
change some project files to make them use the warning config in cpp props file.

* Analyzers C++ turn on warning 4706

Change Cpp.Build.props file to enable 4706
fix BugReportTool code to get rid of 4706

* Turn on warning 4100 and fix the code

* Follow c++ core guidelines

* Adapting to PR comments