Clean up smoke test requirement (#21729)

Cleaning up smoke test dependency: See if all Github action test pass
with removing the smoke test requirement file content.

Checked one by one, and came to see removing all doesn't seem to have
impact on the outcome of running smoke test.(Seems to have no difference
in smoke test result outcome when ran with "Run and Debug" in VS Code
with smoke-test option selected).

Also got rid of below, after checking smoke test correctly passing after
removal of smoke-test-requirement.txt content:
![Screenshot 2023-08-01 at 2 57 45
PM](https://github.com/microsoft/vscode-python/assets/62267334/45d404de-74dd-45a5-885b-71a25ef16ad7)

Resolve: #21496

Author: anthonykim1

.github/actions/smoke-tests/action.yml

@@ -26,7 +26,6 @@ runs:
         cache-dependency-path: |
           build/test-requirements.txt
           requirements.txt
-          build/smoke-test-requirements.txt
 
     - name: Install dependencies (npm ci)
       run: npm ci --prefer-offline
@@ -43,11 +42,6 @@ runs:
         python -m pip --disable-pip-version-check install -t ./pythonFiles/lib/python --implementation py --no-deps --upgrade --pre debugpy
       shell: bash
 
-    - name: pip install smoke test requirements
-      run: |
-        python -m pip install --upgrade -r build/smoke-test-requirements.txt
-      shell: bash
-
     # Bits from the VSIX are reused by smokeTest.ts to speed things up.
     - name: Download VSIX
       uses: actions/download-artifact@v2

build/smoke-test-requirements.txt

@@ -29,7 +29,6 @@ source /workspaces/vscode-python/.venv/bin/activate
 npx gulp installPythonLibs
 
 /workspaces/vscode-python/.venv/bin/python -m pip install -r build/test-requirements.txt
-/workspaces/vscode-python/.venv/bin/python -m pip install -r build/smoke-test-requirements.txt
 /workspaces/vscode-python/.venv/bin/python -m pip install -r build/functional-test-requirements.txt
 
 # Below will crash codespace