Fix known race condition in build

[github-actions]

#8555 (comment)

[wiktork]

##[error]CSC(0,0): error CS2012: (NETCORE_ENGINEERING_TELEMETRY=Build) Cannot open 'D:\a_work\1\s\artifacts\obj\Microsoft.Diagnostics.Monitoring.StartupHook\Release\net6.0\Microsoft.Diagnostics.Monitoring.StartupHook.dll' for writing -- The process cannot access the file 'D:\a_work\1\s\artifacts\obj\Microsoft.Diagnostics.Monitoring.StartupHook\Release\net6.0\Microsoft.Diagnostics.Monitoring.StartupHook.dll' because it is being used by another process.; file may be locked by 'csc' (2012)