Fix clang-tidy warning workflow build invocation (#10349)

The `Build Z3 with clang-tidy warnings` job was failing before
compilation due to an invalid `cmake --build` invocation. The workflow
passed a Ninja-only flag directly to CMake, so the job exited with
`Unknown argument -k` instead of producing the intended warning report.

- **Root cause**
  - The workflow invoked:
    ```bash
    cmake --build build --target shell test-z3 -k 0
    ```
- `-k 0` is a native Ninja argument and must be forwarded through CMake
after `--`.

- **Change**
- Update the clang-tidy warning workflow to pass native build-tool
arguments correctly:
    ```bash
    cmake --build build --target shell test-z3 -- -k 0
    ```

- **Effect**
- The job can now reach the actual Ninja build instead of failing in
CMake argument parsing.
- This restores the intended behavior of collecting clang-tidy/build
diagnostics in the workflow artifact.

- **Files**
  - `.github/workflows/clang-tidy-warning-report.yml`

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

.github/workflows/clang-tidy-warning-report.yml

@@ -46,7 +46,7 @@ jobs:
             2>&1 | tee /tmp/clang-tidy-warning-report/configure.log || configure_status=$?
 
           if [ "$configure_status" -eq 0 ]; then
-            cmake --build build --target shell test-z3 -k 0 \
+            cmake --build build --target shell test-z3 -- -k 0 \
               2>&1 | tee /tmp/clang-tidy-warning-report/build.log || build_status=$?
           else
             printf 'configure failed; build skipped\n' | tee /tmp/clang-tidy-warning-report/build.log