chore: rm lcov support (#5159)

.github/workflows/unit.yml

@@ -27,31 +27,20 @@ jobs:
         uses: actions/checkout@v3
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@stable
-        with:
-          components: llvm-tools-preview
       - uses: Swatinem/rust-cache@v2
         with:
           cache-on-failure: true
 
       - name: Install latest nextest release
         uses: taiki-e/install-action@nextest
-      - name: Install cargo-llvm-cov
-        uses: taiki-e/install-action@cargo-llvm-cov
 
       - name: Run tests
         run: |
-          cargo llvm-cov nextest --lcov --output-path lcov.info \
+          cargo nextest run \
             --locked --all-features --workspace --exclude examples --exclude ef-tests  \
             --partition hash:${{ matrix.partition }}/${{ strategy.job-total }} \
             -E 'kind(lib)' -E 'kind(bin)' -E 'kind(proc-macro)'
 
-      - name: Upload coverage data to codecov
-        uses: codecov/codecov-action@v3
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          files: lcov.info
-          flags: unit-tests
-
   eth-blockchain:
     name: ethereum / state tests (stable)
     runs-on: