Remove unnecessary LFS from coverage workflow

The coverage job only runs bazel test — LFS files are only
documentation images (PNGs) which aren't needed for tests.
Removing lfs: true avoids hook conflicts when ci-internal and
coverage share a self-hosted runner workspace.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jiaenren

.github/workflows/coverage.yaml

@@ -109,8 +109,6 @@ jobs:
 
       - name: Checkout
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
-        with:
-          lfs: true
 
       - name: Setup Bazel
         uses: bazel-contrib/setup-bazel@4fd964a13a440a8aeb0be47350db2fc640f19ca8