[CI][Github] Remove Outdated Comments

5fc3e76ec4f323c22cddf7b9458137510507847a made the pipelines fail on
errors and also removed the TODO comments, but did not remove the
explanatory comments on why things were set up that way. Given things no
longer succeed on error, these comments are outdated and should be
removed.

.github/workflows/premerge.yaml

@@ -35,9 +35,6 @@ jobs:
         with:
           fetch-depth: 2
       - name: Build and Test
-        # Mark the job as a success even if the step fails so that people do
-        # not get notified while the new premerge pipeline is in an
-        # experimental state.
         run: |
           git config --global --add safe.directory '*'
 
@@ -109,9 +106,6 @@ jobs:
           echo "windows-projects=${projects_to_build}" >> $GITHUB_OUTPUT
           echo "windows-check-targets=${project_check_targets}" >> $GITHUB_OUTPUT
       - name: Build and Test
-        # Mark the job as a success even if the step fails so that people do
-        # not get notified while the new premerge pipeline is in an
-        # experimental state.
         if: ${{ steps.vars.outputs.windows-projects != '' }}
         shell: cmd
         run: |