Revert "Update connection string (#6567)" (#6576)

This reverts commit 9a5b198b0b054fa068d3f9e6e0e9f9fb40a4b71a.

frameworks/CSharp/ben/ben.dockerfile

@@ -11,7 +11,7 @@ COPY --from=build /app/out ./
 ENV COMPlus_ReadyToRun 0
 ENV COMPlus_TC_QuickJitForLoops 1
 ENV COMPlus_TieredPGO 1
-ENV DB_CONNECTION Server=tfb-database;Database=hello_world;User Id=benchmarkdbuser;Password=benchmarkdbpass;Maximum Pool Size=18;Enlist=false;Max Auto Prepare=4;Multiplexing=true;Write Coalescing Delay Us=500;Write Coalescing Buffer Threshold Bytes=1000
+ENV DB_CONNECTION Server=tfb-database;Database=hello_world;User Id=benchmarkdbuser;Password=benchmarkdbpass;Maximum Pool Size=256;NoResetOnClose=true;Enlist=false;Max Auto Prepare=4;Multiplexing=true;Write Coalescing Delay Us=500;Write Coalescing Buffer Threshold Bytes=1000
 
 EXPOSE 8080