fix(kubernetes): extract images from initContainers and CronJob templates

[faizanfirdousi]

What this PR does:
Extends FindContainerImages in the standard kubernetes plugin to also extract images from initContainers and CronJob jobTemplate paths. Previously only spec.template.spec.containers[*].image was checked.

Why we need it:
Applications using init containers or CronJobs would have their images missing from version tracking. The kubernetes_multicluster plugin was already fixed in #6808; this brings the standard plugin to parity.

Which issue(s) this PR fixes:
Fixes #6528

Does this PR introduce a user-facing change?:

• How are users affected by this change: Version tracking now correctly includes images from initContainers and CronJobs in the standard kubernetes plugin.
• Is this breaking change: No
• How to migrate (if breaking change): N/A

[github-actions]

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[Copilot]

🟢 Approval recommended

The implementation is straightforward, matches the stated requirements, and is backed by targeted tests for the new manifest paths.

Pull request overview

This PR updates the PipeCD pipedv1 Kubernetes plugin to improve artifact version tracking by ensuring FindContainerImages detects container images not only in standard workload containers, but also in initContainers and CronJob jobTemplate pod specs—bringing the standard plugin in line with the previously-fixed multicluster plugin behavior.

Changes:

• Extend FindContainerImages to extract images from spec.template.spec.initContainers[*].image.
• Extend FindContainerImages to extract images from CronJob spec.jobTemplate.spec.template.spec.{containers,initContainers}[*].image.
• Add unit tests covering initContainers, CronJob jobTemplate paths, and deduplication behavior.

File summaries

File	Description
pkg/app/pipedv1/plugin/kubernetes/provider/deployment.go	Expands image extraction paths to include initContainers and CronJob jobTemplate pod specs.
pkg/app/pipedv1/plugin/kubernetes/provider/deployment_test.go	Adds coverage for the newly supported image locations and verifies deduplication.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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