Reduce number of layers for Beam container images #43561

Job	Run time
Java Unit Tests (self-hosted, ubuntu-24.04, main)	2m 58s
Java Unit Tests (windows-latest)	16m 53s
Java Wordcount Direct Runner (self-hosted, ubuntu-24.04, main)	2m 45s
Java Unit Tests (macos-latest)	2m 42s
Java Wordcount Direct Runner (windows-latest)	22m 57s
Java Wordcount Direct Runner (macos-latest)	2m 36s
	50m 51s

Provide feedback