refactor: use OSS Pulsar image and charts for e2e tests

[mattsre]

This PR is stacked on #365 and should be rebased once that PR is merged

Motivation

CI runs on an ancient version of K8S and old versions of Pulsar. Newer versions of sn-platform images require a license key to run, so these cannot easily be bumped. The existing e2e tests rely on exec'ing into pods and running pulsarctl commands, but this binary is not in OSS Pulsar images which makes it difficult to test locally for OSS contributors looking to make changes to the project.

Modifications

• Update CI to run on k8s 1.34 and use OSS Pulsar 4.1 Docker images
• Update tests to work with OSS Pulsar images (no pulsarctl available in images)
• Fix some lint findings

Verifying this change

• Make sure that the change passes the CI checks.

This change is already covered by existing tests. CI upgrade was tested on a PR in my fork here: mattsre#1 as well as running locally

Documentation

• no-need-doc

Internal changes to CI and tests, no package changes

[Copilot]

Pull request overview

This PR refactors the e2e test infrastructure to use open-source Apache Pulsar images and Helm charts instead of proprietary StreamNative Platform images. The motivation is to enable testing on newer Kubernetes versions and make it easier for OSS contributors to run tests locally without requiring license keys. The changes update CI workflows, test utilities, and configuration files to work with OSS Pulsar images that don't include the pulsarctl binary. Additionally, the PR addresses various lint findings from the golangci-lint v2 configuration upgrade.

Key Changes:

• Migrates from StreamNative Platform 2.10.4.3 to Apache Pulsar 4.1.2 Docker images
• Updates test commands from pulsarctl to pulsar-admin for compatibility with OSS images
• Updates Kubernetes version support from v1.19.11 to v1.34.2
• Upgrades golangci-lint from v1.55.2 to v2.7.2 with v2 configuration format

Reviewed changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.github/workflows/e2e_test.yml	Updates CI to use OSS Pulsar 4.1.2 image, K8s v1.34.2, kind v0.31.0, and Apache Pulsar Helm chart
.github/workflows/golangci-lint.yml	Upgrades golangci-lint action and version to v2.7.2
.golangci.yml	Migrates lint configuration to v2 format with updated linters and settings
.ci/clusters/values.yaml	Configures Helm chart to use OSS Pulsar 4.1.2 images instead of StreamNative Platform
tests/operator/resources_test.go	Replaces pulsarctl commands with pulsar-admin, updates to use ptr.To instead of pointer, fixes lint issues
tests/utils/k8s.go	Adds context parameter to ExecInPod and uses StreamWithContext
tests/utils/spec.go	Fixes struct initialization, updates type aliases, replaces interface{} with any
pkg/admin/impl.go	Simplifies nonPartitioned logic
controllers/	Minor lint fixes (removes unnecessary object metadata references)
scripts/lint.sh	Updates golangci-lint version to v2.7.2
hack/kind-cluster-build.sh	Updates default K8s version to v1.34.2
README.md	Updates documented K8s version support to v1.34
.gitignore	Adds local development tool entries
go.sum	Adds missing go.mod entry

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[Copilot]

The version field is set to "2" which refers to the golangci-lint configuration file format version, not the golangci-lint tool version. However, this is inconsistent with the actual golangci-lint versions being used in the scripts and workflows. The configuration format version 2 is correct for newer golangci-lint versions (v1.60+), but the tool versions specified elsewhere (v2.7.2) do not exist. Ensure this configuration is compatible with the actual golangci-lint version being used.