Add exclude + additionals option to AssembleDownstreamDocumentation #247

Job	Run time
CI Sanity Check	31s
Attach pull request number	0s
Initial JDK 17 Build	20m 29s
Calculate Test Jobs	12s
JVM Tests - JDK 17	1m 30s
JVM Tests - JDK 21	1m 25s
JVM Tests - JDK 17 Windows	2m 52s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Quickstarts Compilation - JDK 17	6m 16s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
MicroProfile TCKs Tests	0s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
Native Tests - ${{ matrix.category }}	0s
Build report	13s
	33m 28s

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