Remove temporary e2e hack to use knowledge v3 PR

Now that instructlab/instructlab#1790 has merged, we can remove
this.

Signed-off-by: Mark McLoughlin <[email protected]>

.github/workflows/e2e.yml

@@ -76,13 +76,6 @@ jobs:
           # config contains DEFAULT_MODEL
           key: huggingface-${{ hashFiles('src/instructlab/configuration.py') }}
 
-      - name: Switch instructlab to PR 1790 (TEMPORARY)
-        run: |
-          cd instructlab
-          git fetch origin pull/1790/head:pr1790
-          git checkout pr1790
-          cd ..
-
       - name: Install instructlab and instructlab-sdg
         run: |
           export PATH="/home/runner/.local/bin:/usr/local/cuda/bin:$PATH"