Expose add-modules JVM option in SDKHarnessOptions

[Abacn]

Adds support for --add-modules JVM option through a new pipeline option JdkAddRootModules

fixes: #30281

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Mention the appropriate issue in your description (for example: addresses #123), if applicable. This will automatically add a link to the pull request in the issue. If you would like the issue to automatically close on merging the pull request, comment fixes #<ISSUE NUMBER> instead.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI or the workflows README to see a list of phrases to trigger workflows.

[Abacn]

Tested on Dataflow v2 + Java 21 with a pipeline uses "jdk.incubator.vector"

Beam 2.63.0 (job Id 2025-03-13_15_08_35-746015370466363900):

"org.apache.beam.sdk.util.UserCodeException: java.lang.NoClassDefFoundError: jdk/incubator/vector/Vector
	at org.apache.beam.sdk.util.UserCodeException.wrap(UserCodeException.java:39)
	at com.github.abacn.VectorTest$1$DoFnInvoker.invokeProcessElement(Unknown Source)

with this change (build java core locally, build a custom container, add pipeline option --sdkContainerImage=gcr.io/.../beam_java21_sdk:2.63.0-custom --jdkAddRootModules=jdk.incubator.vector), it succeeded. job id: 2025-03-13_15_22_36-15628134386308323283

[Abacn]

R: @kennknowles

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[Abacn]

also worked for Dataflow legacy runner (after internal change)

job id: 2025-03-14_08_57_18-6904344628307499835

[Abacn]

R: @dannymccormick

[Abacn]

R: @tvalentyn (internal tracker: b/337016101)

[tvalentyn]

Thanks!

[tvalentyn]

(Updated pr description)

[Abacn]

failed Dataflow worker test:

• testCommit_handlesFailedCommits
• testStop_successfullyTerminates
• testLatencyAttributionToCommittingState

not related to the change