build: fully remove java17-jdk variant from build (#2904)

Author: itzg

.github/workflows/build-multiarch.yml

@@ -60,10 +60,6 @@ jobs:
             baseImage: container-registry.oracle.com/graalvm/jdk:17-ol8
             platforms: linux/amd64,linux/arm64
             mcVersion: 1.20.4
-          - variant: java17-jdk
-            baseImage: eclipse-temurin:17-focal
-            platforms: linux/amd64,linux/arm/v7,linux/arm64
-            mcVersion: 1.20.4
           - variant: java17-alpine
             baseImage: eclipse-temurin:17-jre-alpine
             platforms: linux/amd64