Add workflow_dispatch for llm unittest workflow (#8485)

.github/workflows/llm_unit_tests_linux.yml

@@ -28,6 +28,7 @@ on:
       - '.github/actions/llm/cli-test/action.yml'
       - '.github/actions/llm/inference-test/action.yml'
       - '.github/actions/llm/langchain-test/action.yml'
+  workflow_dispatch:
 
 env:
   INT4_CKPT_DIR: ./llm/ggml-actions/stable

.github/workflows/llm_unit_tests_windows.yml

@@ -18,6 +18,7 @@ on:
     paths:
       - 'python/llm/**'
       - '.github/workflows/llm_unit_tests_windows.yml'
+  workflow_dispatch:
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs: