[CI] [GHA] Remove usage of the SimenB/github-actions-cpu-cores acti…

…on (openvinotoolkit#23583)

### Details:
 - The action does not have a License.
 - `cmake` should figure out the # of cores for parallel.

.github/workflows/code_snippets.yml

@@ -39,9 +39,5 @@ jobs:
       - name: CMake configure
         run: cmake -DCMAKE_BUILD_TYPE=Release -DTHREADING=SEQ -B build
 
-      - name: Get number of CPU cores
-        uses: SimenB/github-actions-cpu-cores@v2
-        id: cpu-cores
-
       - name: Build snippets
-        run:  cmake --build build --target openvino_docs_snippets --parallel ${{ steps.cpu-cores.outputs.count }}
+        run:  cmake --build build --target openvino_docs_snippets --parallel

.github/workflows/coverage.yml

@@ -54,10 +54,6 @@ jobs:
           python3 -m pip install -r ${{ github.workspace }}/tools/mo/requirements_tf2.txt
           python3 -m pip install -r ${{ github.workspace }}/tools/mo/requirements_dev.txt
 
-      - name: Get number of CPU cores
-        uses: SimenB/github-actions-cpu-cores@v2
-        id: cpu-cores
-
       - name: Build OpenVINO with CMake
         uses: ashutoshvarma/action-cmake-build@master
         with:
@@ -81,7 +77,6 @@ jobs:
             -DCMAKE_CXX_LINKER_LAUNCHER=ccache
             -DENABLE_SYSTEM_SNAPPY=ON
           build-type: Release
-          parallel: ${{ steps.cpu-cores.outputs.count }}
 
       - name: Install wheel packages
         run: cmake -DCOMPONENT=python_wheels -DCMAKE_INSTALL_PREFIX=${{ github.workspace }}/install_pkg -P '${{ github.workspace }}/build/cmake_install.cmake'
@@ -129,7 +124,6 @@ jobs:
             -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
             -DCMAKE_C_LINKER_LAUNCHER=ccache
             -DCMAKE_CXX_LINKER_LAUNCHER=ccache
-          parallel: ${{ steps.cpu-cores.outputs.count }}
 
 
       - name: Print info