fix(ci): force-reinstall enterprise package to override PyPI version

poetry install includes litellm-enterprise from PyPI, then the editable
install step runs. When the same version is already installed, pip may
skip the editable install leaving the PyPI build in place - which may
lack methods added after the latest PyPI release. Adding
--force-reinstall ensures the local editable version always wins.

Fixes enterprise tests failing with AttributeError on methods that exist
locally but not in the cached PyPI-installed package.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/test-litellm-matrix.yml

@@ -100,7 +100,7 @@ jobs:
 
       - name: Setup litellm-enterprise
         run: |
-          cd enterprise && poetry run pip install -e . && cd ..
+          cd enterprise && poetry run pip install --force-reinstall -e . && cd ..
 
       - name: Generate Prisma client
         run: |