[CI] Introduce placeholder sycl-ur-perf-benchmarking.yml (#17611)

This PR adds a placeholder sycl-ur-perf-benchmarking.yml in preparation
for testing and merging the benchmark.yml in
#17229.

Author: ianayl

.github/workflows/sycl-ur-perf-benchmarking.yml

@@ -0,0 +1,12 @@
+name: Benchmarks
+
+# This workflow is a WIP: this workflow file acts as a placeholder.
+
+on: [ workflow_dispatch ]
+
+jobs:
+  do-nothing:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo 'This workflow is a WIP.'
+

.github/workflows/ur-benchmarks-reusable.yml

@@ -1,6 +1,8 @@
 name: Benchmarks Reusable
 
 # This workflow is a WIP: This workflow file acts as a placeholder.
+#
+# This workflow is set to be merged into benchmark.yml
 
 on: [ workflow_call ]
 

.github/workflows/ur-benchmarks.yml

@@ -1,6 +1,8 @@
 name: Benchmarks
 
 # This workflow is a WIP: this workflow file acts as a placeholder.
+#
+# This workflow is set to be merged into benchmark.yml
 
 on: [ workflow_dispatch ]