Add Java 25 tests

[Abacn]

Fix #35627

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[Abacn]

beam_PostCommit_Java_Examples_Dataflow_Java: https://github.com/apache/beam/actions/runs/18286174083/job/52061661440

beam_PostCommit_Java_Examples_Dataflow_ARM: https://github.com/apache/beam/actions/runs/18290156063

beam_PostCommit_Java_Examples_Dataflow_V2_Java: https://github.com/apache/beam/actions/runs/18290257189

beam_PostCommit_Java_ValidatesRunner_Dataflow_JavaVersions: https://github.com/apache/beam/actions/runs/18297391474/job/52098424890

beam_PostCommit_Java_ValidatesRunner_Direct_JavaVersions: https://github.com/apache/beam/actions/runs/18286182845

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[Abacn]

assign set of reviewers

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Assigning reviewers:

R: @m-trieu for label java.
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[Abacn]

PreCommit Java PVR Prism Loopback failed 3 times:

testComposedCombineWithContext

java.lang.AssertionError: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: The Runner experienced the following error during execution:
bundle inst012 stage-012 failed:org.apache.beam.sdk.util.UserCodeException: java.util.NoSuchElementException: Empty PCollection accessed as a singleton view.
	at org.apache.beam.sdk.util.UserCodeException.wrap(UserCodeException.java:39)
...
Caused by: java.util.NoSuchElementException: Empty PCollection accessed as a singleton view.
	at org.apache.beam.sdk.values.PCollectionViews$SingletonViewFn2.getDefaultValue(PCollectionViews.java:518)
	at org.apache.beam.sdk.values.PCollectionViews$SingletonViewFn2.apply(PCollectionViews.java:545)

checked that the same test also failing in other unrelated PRs (e.g. https://github.com/apache/beam/actions/runs/18231655679/job/51916196342). Also checked the same test passed locally when running the test alone, appears to be a flaky test

[Abacn]

R: @Amar3tto @damccorm

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[damccorm]

Thanks! LGTM, just had one question (doesn't need to be handled here, but should be an easy cleanup). Feel free to merge without addressing or after addressing

[damccorm]

Thanks