[improve][build] Upgrade kubernetes client-java to 26.0.0

[lhotari]

Motivation

Previously it wasn't possible to upgrade beyond 23.0.0 due to the bug that is fixed by OpenAPITools/openapi-generator#22498 . The 26.0.0 client-java release uses 7.18.0 openapi-generator and the stubs were generated in PR kubernetes-client/java#4535.

The io.kubernetes:client-java 26.0.0 release adds software.amazon.awssdk:sts as a direct dependency to support EKS IAM authentication (IRSA). That single dependency transitively pulls in ~28 AWS SDK v2 jars (about 8 MB) plus software.amazon.eventstream:eventstream.

Pulsar uses the kubernetes client only for in-cluster API access (functions runtime, OIDC auth, secrets, integration tests) and does not need the AWS authentication path. Bundling the AWS SDK jars in the binary distribution would be pure dead weight.

Modifications

• Bumped kubernetesclient from 23.0.0 to 26.0.0 in gradle/libs.versions.toml.
• Added exclude(group = "software.amazon.awssdk") to every consumer of libs.kubernetes.client.java (and libs.kubernetes.client.java.api.fluent):
  • pulsar-broker-auth-oidc/build.gradle.kts
  • pulsar-functions/runtime/build.gradle.kts
  • pulsar-functions/secrets/build.gradle.kts
  • tests/integration/build.gradle.kts
• Updated the three io.kubernetes-client-java* jar version entries in distribution/server/src/assemble/LICENSE.bin.txt from 23.0.0 to 26.0.0. No AWS SDK LICENSE entries were added because the jars are no longer bundled.

The commit also pulls along a few unrelated in-flight changes in tests/integration (joda-time test dep, TestNG suite handling that defers to --tests CLI filter, and small fixes in AbstractPulsarStandaloneK8STest) that were already staged on this branch.

Verifying this change

• Make sure that the change passes the CI checks.

This change is already covered by existing tests:

• ./gradlew checkBinaryLicense passes (verifies no missing LICENSE/NOTICE entries against the produced apache-pulsar-*-bin.tar.gz, confirming the AWS SDK is no longer bundled).
• ./gradlew spotlessCheck checkstyleMain checkstyleTest passes on the modified modules.

Does this pull request potentially affect one of the following parts:

• Dependencies (add or upgrade a dependency)

The io.kubernetes:client-java runtime dependency moves from 23.0.0 to 26.0.0. Transitive software.amazon.awssdk:* and software.amazon.eventstream:eventstream (newly introduced by 26.0.0) are excluded everywhere client-java is consumed, so the binary distribution gains only the kubernetes-client version bump.

[dao-jun]

LGTM