Reintroduce integration test project in pipeline

The integration test project has been reintroduced in the
`azure-pipelines.yml` file. The previously commented-out
line for the integration test project has been removed,
allowing it to be included in the build process again.
This change addresses the issue tracked in GitHub.

Author: baseTwo

build/azure-pipelines.yml

@@ -96,8 +96,7 @@ stages:
         **/*Tests/*Tests.csproj
         **/**/Test.Measures.Demo.csproj
         !**/Ncqa.HT.DeckTests.csproj
-        # TODO: Reintroduce integration test back in issue: https://github.com/FirelyTeam/firely-cql-sdk/issues/971
-        # submodules\Firely.Cql.Sdk.Integration.Runner\IntegrationRunner\IntegrationRunner.csproj
+        submodules\Firely.Cql.Sdk.Integration.Runner\IntegrationRunner\IntegrationRunner.csproj
       packageArtifacts: true
       restoreDependencies: true
       nuGetServiceConnections: GitHubPackageGetFeed