chore(ci): reduce web test shard fan-out (#34215)

.github/workflows/web-tests.yml

@@ -22,8 +22,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        shardIndex: [1, 2, 3, 4, 5, 6]
-        shardTotal: [6]
+        shardIndex: [1, 2, 3, 4]
+        shardTotal: [4]
     defaults:
       run:
         shell: bash
@@ -66,7 +66,6 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
-          fetch-depth: 0
           persist-credentials: false
 
       - name: Setup web environment