CI - Check that C# bindings are up to date (#3362)

# Description of Changes

Check that our generated C# files are up-to-date in our CI.

# API and ABI breaking changes

None.

# Expected complexity level and risk

1

# Testing

- [x] CI all passes

---------

Co-authored-by: Zeke Foppa <bfops@users.noreply.github.com>

.github/workflows/csharp-test.yml

@@ -91,6 +91,15 @@ jobs:
               exit 1
           }
 
+      - name: Check client-api bindings are up to date
+        working-directory: sdks/csharp
+        run: |
+          bash tools~/gen-client-api.sh
+          "${GITHUB_WORKSPACE}"/tools/check-diff.sh src/SpacetimeDB/ClientApi || {
+              echo 'Error: Client API bindings are dirty. Please run `sdks/csharp/tools~/gen-client-api.sh`.'
+              exit 1
+          }
+
       - name: Generate client bindings
         working-directory: demo/Blackholio/server-rust
         run: bash ./generate.sh -y
@@ -116,7 +125,12 @@ jobs:
           disown
 
       - name: Run regression tests
-        run: bash sdks/csharp/tools~/run-regression-tests.sh
+        run: |
+          bash sdks/csharp/tools~/run-regression-tests.sh
+          tools/check-diff.sh sdks/csharp/examples~/regression-tests || {
+              echo 'Error: Bindings are dirty. Please run `sdks/csharp/tools~/gen-regression-tests.sh`.'
+              exit 1
+          }
 
       - name: Publish unity-tests module to SpacetimeDB
         working-directory: demo/Blackholio/server-rust