chore: risedev clean java targets (#12600)

Makefile.toml

@@ -461,6 +461,12 @@ cargo build -p risingwave_cmd_all \
 [tasks.clean]
 private = true
 category = "RiseDev - Build"
+description = "Clean all build targets"
+dependencies = ["clean-rust", "clean-java"]
+
+[tasks.clean-rust]
+private = true
+category = "RiseDev - Build"
 description = "Clean Rust targets"
 condition = { env_set = ["ENABLE_BUILD_RUST"] }
 script = '''
@@ -469,6 +475,25 @@ set -e
 cargo clean
 '''
 
+[tasks.clean-java]
+private = true
+category = "RiseDev - Build"
+description = "Clean Rust targets"
+condition = { env_set = ["ENABLE_RW_CONNECTOR", "ENABLE_BUILD_RW_CONNECTOR"] }
+script = '''
+#!/usr/bin/env bash
+set -e
+
+if command -v mvn &> /dev/null; then
+  MAVEN_PATH="$(command -v mvn)"
+else
+  MAVEN_PATH="${PREFIX_BIN}/maven/bin/mvn"
+fi
+
+cd "${JAVA_DIR}"
+"${MAVEN_PATH}" clean
+'''
+
 [tasks.build-docs]
 private = true
 category = "RiseDev - Build"