Separate app-manager and app-framework from WAMR (#3129)

As planned, the app-manager and app-framework are to be migrated to
https://github.com/bytecodealliance/wamr-app-framework.

ps.
https://github.com/bytecodealliance/wasm-micro-runtime/issues/2329
https://github.com/bytecodealliance/wasm-micro-runtime/wiki/TSC-meeting-notes

.github/workflows/nightly_run.yml

@@ -13,7 +13,7 @@ on:
     paths:
       - ".github/workflows/nightly_run.yml"
       - "core/iwasm/libraries/lib-wasi-threads/stress-test/**"
-      
+
   # midnight UTC
   schedule:
     - cron: "0 0 * * *"
@@ -489,12 +489,6 @@ jobs:
           cmake ..
           cmake --build . --config Release --parallel 4
           ./hello
-      - name: Build Sample [simple]
-        run: |
-          ./build.sh -p host-interp
-          python3 ./sample_test_run.py $(pwd)/out
-          exit $?
-        working-directory: ./samples/simple
 
       - name: Build Sample [wasi-threads]
         run: |