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Remove a bunch of files from fantomas ignore #18407
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…/fsharp into try-less-fantomas-ignores
              
                    psfinaki
  
              
              approved these changes
              
                  
                    Mar 26, 2025 
                  
              
              
            
            
              
                    KevinRansom
  
              
              approved these changes
              
                  
                    Mar 27, 2025 
                  
              
              
            
            
  This was referenced Apr 25, 2025 
      
  
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This ended up doing a chore which was longer overdue:
clean up historical build flags for nullables, and use the one which ships with the SDK (
<Nullable>). This was not possible before, since our build was using last-known-good FSharp.BuildDrastically reduce the number of ifdefs, which were preventing Fantomas from working (ifdefs over entire val/let definitions work just fine, ifdefs for local parts like type argument constraints were making it fail)
Enable nullables unconditionally also for LKG and Proto builds
(1 special case still triggers warning which I had to nowarn. It is code generated code coming from the Fsharp resource task - the codegen comes from LKG FSharp.Build.dll, we have to wait a little)
With all of that, I could enable Fantomas for a big chunk of files, which is the reason for most of the diff here