Fix broken build action (#17417)

* Whoops broke the build

* Run the workflow on PR to verify (disable PR one)

* Install JediLSP for Python 3 only

* Undo pr check testing changes

Author: kimadeline

.github/workflows/build.yml

@@ -117,6 +117,10 @@ jobs:
           # We need to have debugpy so that tests relying on it keep passing, but we don't need install_debugpy's logic in the test phase.
           python -m pip --disable-pip-version-check install -t ./pythonFiles/lib/python --no-cache-dir --implementation py --no-deps --upgrade --pre debugpy
 
+      - name: Install Jedi LSP requirements
+        run: python -m pip --disable-pip-version-check install -t ./pythonFiles/lib/jedilsp --no-cache-dir --implementation py --no-deps --upgrade -r ./jedils_requirements.txt
+        if: startsWith(matrix.python, 3.)
+
       - name: Install test requirements
         run: python -m pip install --upgrade -r build/test-requirements.txt