[CI] Test 'all' make target on Windows in nightly (#18708)

Nightly run
[here](https://github.com/intel/llvm/actions/runs/15305462309), I
cancelled all non-relevant jobs.

We only install/package the `deploy-sycl-toolchain` target so building
for `all` on the real nightly job that's uploaded should be fine.

Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>

Author: sarnex

.github/workflows/sycl-nightly.yml

@@ -152,6 +152,7 @@ jobs:
       artifact_archive_name: sycl_windows.tar.gz
       # Disable the spirv-dis requirement as to not require SPIR-V Tools.
       build_configure_extra_args: -DLLVM_SPIRV_ENABLE_LIBSPIRV_DIS=off
+      build_target: all
 
   e2e-win:
     needs: build-win

.github/workflows/sycl-windows-build.yml

@@ -10,6 +10,10 @@ on:
       build_configure_extra_args:
         type: string
         required: false
+      build_target:
+        type: string
+        required: false
+        default: sycl-toolchain
       changes:
         type: string
         description: 'Filter matches for the changed files in the PR'
@@ -58,6 +62,11 @@ on:
       build_configure_extra_args:
         type: string
         required: false
+      build_target:
+        type: choice
+        options:
+          - "sycl-toolchain"
+          - "all"
       artifact_archive_name:
         type: choice
         options:
@@ -143,7 +152,7 @@ jobs:
       id: build
       shell: bash
       run: |
-        cmake --build build --target sycl-toolchain
+        cmake --build build --target ${{ inputs.build_target }}
     - name: check-llvm
       if: always() && !cancelled() && contains(inputs.changes, 'llvm')
       shell: bash