ci: remove benchmark from rust_ci since we don't have any

.github/workflows/rust_ci.yaml

@@ -62,27 +62,6 @@ jobs:
       - name: chown target
         run: |
           sudo chown -R $(id -u):$(id -g) ./target
-  cargo-build-benches:
-    runs-on: ubuntu-latest
-    timeout-minutes: 20
-    name: build-benchmarks
-    continue-on-error: true
-    steps:
-      - name: Checkout sources
-        uses: actions/checkout@v4
-        with:
-          submodules: true
-      - uses: taiki-e/install-action@just
-      - name: Install Rust stable toolchain
-        uses: dtolnay/rust-toolchain@stable
-      - uses: Swatinem/rust-cache@v2
-        with:
-          cache-on-failure: true
-      - name: build benches
-        run: cargo bench --no-run --workspace --all --features test-utils
-      - name: chown target
-        run: |
-          sudo chown -R $(id -u):$(id -g) ./target
   cargo-build:
     runs-on: ubuntu-latest
     timeout-minutes: 20