ci: consolidate rust + protoc install across workflows (#23700)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/rerun-test.yml

@@ -153,11 +153,9 @@ jobs:
 
       # Needed by setuptools-rust to build the bundled native gRPC extension
       # (rust/sglang-grpc) when installing the main `sglang` wheel from source.
-      - name: Install protoc
-        run: sudo bash scripts/ci/utils/install_protoc.sh
-
-      - name: Install Rust toolchain
-        run: bash scripts/ci/utils/install_rustup.sh
+      - name: Install protoc + Rust toolchain
+        timeout-minutes: 10
+        run: bash scripts/ci/utils/install_rust_protoc.sh
 
       - name: Install dependencies
         timeout-minutes: 20