Add cargo-llvm-cov to CI workflow

Move installation before generating code coverage and update Codecov token secret

Author: zharinov

.github/workflows/test.yml

@@ -34,6 +34,9 @@ jobs:
         with:
           components: clippy, llvm-tools-preview
 
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+
       - name: Using Rust cache
         uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2.8.2
         with:
@@ -44,16 +47,13 @@ jobs:
       - name: Clippy
         run: cargo clippy --workspace --all-targets -- -D warnings
 
-      - name: Install cargo-llvm-cov
-        uses: taiki-e/install-action@cargo-llvm-cov
-
       - name: Generate code coverage
         run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
 
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
+          token: ${{ secrets.CODECOV_SECRET }}
           files: lcov.info
           fail_ci_if_error: true
           slug: zharinov/plotnik