User Story 37654: Create Extensions base package

- Fixing incorrect solution name.

Author: paulmedynski

eng/pipelines/stages/ci-build-extensions-package-stage.yml

@@ -79,7 +79,7 @@ stages:
 
         # The Extensions solution file to use for all dotnet CLI commands.
         - name: project
-          value: src/Microsoft.Data.SqlClient.Extensions/Extensions/Microsoft.Data.SqlClient.Extensions.slnx
+          value: src/Microsoft.Data.SqlClient.Extensions/Extensions/Extensions.slnx
 
         # dotnet CLI arguments common to all commands.
         - name: commonArguments