ci: remove unnecessary JDK/Maven setup from unit-tests

Only 5 of 3,943 unit tests need Java, and they already have
skip_if_maven_not_available() guards. Java execution is validated
by the e2e-java job. Saves ~30-60s per matrix entry (7 entries).

Author: KRRT7

.github/workflows/ci.yaml

@@ -118,19 +118,6 @@ jobs:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Set up JDK 11
-        uses: actions/setup-java@v4
-        with:
-          java-version: '11'
-          distribution: 'temurin'
-          cache: maven
-
-      - name: Build codeflash-runtime JAR
-        run: |
-          cd codeflash-java-runtime
-          mvn clean package -q -DskipTests
-          mvn install -q -DskipTests
-
       - name: Install uv
         uses: astral-sh/setup-uv@v8.0.0
         with: