[release/9.0] Don't pass empty string as SNI to QUIC - #133158

‼️ Build Analysis Check Result has been manually overridden

• The build analysis check result has been updated by the user for the following reason: test failures are all known
  
• The check result has changed from Failure to Success

⚠️ The following pipeline(s) will not be analyzed as has been explicited excluded from analysis

• dotnet-linker-tests

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