test: harden bounded Kafka supervisor timeouts

[FrankChen021]

Description

KafkaBoundedSupervisorTest can exceed the embedded cluster's default 60-second latch timeout while a bounded supervisor starts tasks, consumes records, and publishes segments.

The post-merge CI run for PR #20106 provides the evidence:

• The Unit & Integration tests CI run 32516481844 failed in job 96879148560.
• The failed JDK 25 shard timed out in KafkaBoundedSupervisorTest.test_boundedSupervisor_doesNotSilentlyCompleteWhenStaleOffsetExceedsNewEnd while waiting for 250 published records.
• The same shard passed before merge in PR fix(server): master branch CI failure #20106.
• PR #19543 previously addressed the same cold-start timing issue by using a 120-second wait for one bounded-supervisor ingestion path.

This change:

• Applies a 120-second maximum wait to the bounded-supervisor ingestion waits. The timeout is a ceiling, not a fixed delay.
• Uses maxRowsPerSegment = 100 for this test class instead of the shared fixture's one-row segments. This reduces segment rollover and publication overhead while preserving the test's offset, row-count, and supervisor-state assertions.

There is no user-facing behavior change.

Release note

No user-facing behavior change.

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Key changed/added classes in this PR

• KafkaBoundedSupervisorTest

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This PR has:

• been self-reviewed.
• modified an existing test to cover the affected CI timing path.
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description (test-only change).
• added or updated version, license, or notice information in licenses.yaml.

Local verification:

mvn test -pl embedded-tests -am -Dtest=org.apache.druid.testing.embedded.indexing.KafkaBoundedSupervisorTest -Dsurefire.failIfNoSpecifiedTests=false -Pskip-static-checks -Dweb.console.skip=true -T1

Result: 6 tests passed; Maven reactor BUILD SUCCESS.

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