Revert skipTests: run all tests in CI as requested

Co-authored-by: sergey-tihon <1197905+sergey-tihon@users.noreply.github.com>

Author: Copilot

.github/workflows/dotnetcore.yml

@@ -45,5 +45,3 @@ jobs:
         run: dotnet paket restore
       - name: Build and Test
         run: dotnet fsi build.fsx
-        env:
-          skipTests: true