[CI] Test on all devices when not specified (#18356)

Nightly https://github.com/intel/llvm/actions/runs/14892412297

We forgot to set `target_devices` when moving the nightly Windows
run-tests job over to the composite workflow, but we can't require it to
be set because it needs to be unset for `build-only` mode, so just use
`all` if not specified and fix the nightly.

Currently we get a CMake error because `sycl_devices` is empty which
fails to be parsed.

---------

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

Author: sarnex

.github/workflows/sycl-nightly.yml

@@ -163,6 +163,7 @@ jobs:
     with:
       name: Intel GEN12 Graphics with Level Zero
       runner: '["Windows","gen12"]'
+      target_devices: level_zero:gpu
       sycl_toolchain_archive: ${{ needs.build-win.outputs.artifact_archive_name }}
 
   cuda-aws-start:

devops/actions/run-tests/e2e/action.yml

@@ -10,7 +10,8 @@ inputs:
   extra_cmake_args:
     required: false
   target_devices:
-    required: true
+    required: false
+    default: all
   extra_lit_opts:
     required: false
   retention-days:

devops/actions/run-tests/windows/e2e/action.yml

@@ -10,7 +10,8 @@ inputs:
   extra_cmake_args:
     required: false
   target_devices:
-    required: true
+    required: false
+    default: all
   extra_lit_opts:
     required: false
   retention-days: