Fix logs and describe for Pipelines-in-Pipelines

[kamal2730]

Changes

Resolve child PipelineRun TaskRuns recursively in tkn pipelinerun logs and describe. TaskRuns from child PipelineRuns are now displayed with a ">" prefix (e.g., "call-child > greet") to indicate nesting depth. This works for any level of nesting and supports both available and follow/live modes.

Implementation Details:

• Logs: recursive getOrderedTasks/getChildOrderedTasks and recursive GetTaskRunsWithStatus tracking.
• Describe: replaced direct ChildReferences iteration with GetTaskRunsWithStatus for automatic PinP resolution.

Fixes #2886

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Run the code checkers with make check
• Regenerate the manpages, docs and go formatting with make generated
• Commit messages follow commit message best practices

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Release Notes

tkn pipelinerun logs and describe now support Pipelines-in-Pipelines (PinP): TaskRuns inside child PipelineRuns are shown inline with a ">" prefix (e.g. "call-child > greet")

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• ✅ login: kamal2730 / name: kamal2730 (9db9349)

[kamal2730]

Hi @twoGiants , this PR is ready for review. Kindly review it when you have time.