feat: add -o yaml and -o json to tkn version

[anwesha-palit-redhat]

Changes

Added -o/--output support to tkn version.

• Supports json and yaml output for tkn version.
• Supports structured output with --component.
• Default output remains unchanged.
• Invalid output formats and component values return clear errors.

Examples:

$ tkn version -o json
{
    "client": "dev",
    "dashboard": "devel",
    "pipeline": "devel"
}

$ tkn version --component pipeline -o yaml
pipeline: devel

Submitter Checklist

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

• Includes [[tests](https://github.com/tektoncd/community/blob/master/standards.md#principles)](https://github.com/tektoncd/community/blob/master/standards.md#principles)
• Run the code checkers with make check
• Regenerate the manpages, docs and go formatting with make generated
• Commit messages follow [[commit message best practices](https://github.com/tektoncd/community/blob/master/standards.md#commit-messages)]

See [[the contribution guide](https://github.com/tektoncd/cli/blob/main/CONTRIBUTING.md)](https://github.com/tektoncd/cli/blob/main/CONTRIBUTING.md) for more details.

Release Notes

`tkn version` now supports `--output json` and `--output yaml`, including with `--component`.

[Copilot]

Copilot review overview

🟡 Changes recommended

The no-kubeconfig path rejects the valid hub component, and the generated examples are incorrectly formatted.

Get a fresh assessment by requesting another Copilot review.

Review effort: Balanced
Findings: 1 · 1

Open (2)

• Handle hub component when client creation fails · New
• Fix command description indentation in generated docs · New

What changed in this PR

Adds JSON/YAML output support to tkn version, including component-specific output.

Changes:

• Adds -o json|yaml and validation.
• Adds structured-output tests.
• Regenerates command and manpage documentation.

File	Description
pkg/​cmd/​version/​version.go	Implements structured version output.
pkg/​cmd/​version/​version_test.go	Tests formats, components, and errors.
docs/​man/​man1/​tkn-version.1	Updates generated manpage.
docs/​cmd/​tkn_version.md	Updates generated command reference.

---

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[Copilot]

Copilot review overview

🟡 Changes recommended

Invalid components can still exit successfully, and the new examples generate malformed documentation formatting.

Get a fresh assessment by requesting another Copilot review.

Review effort: Balanced
Findings: 1

Open (1)

• Return an error for invalid components without output · New

Resolved since last review (2)

• Handle hub component when client creation fails
• Fix command description indentation in generated docs

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[divyansh42]

Changes looks good to me.

One small observation (not blocking): the if formatted.IsStructured(output) check is now repeated for every component case, which adds quite a bit of duplication. This pattern was already there before your PR, but it got amplified. Might be worth filing a follow-up issue to refactor this later - something like collecting all the version data first, then deciding how to output it once. Would cut down a lot of the repetitive code. But that's definitely a separate cleanup task, not something to hold up this PR.

[divyansh42]

/lgtm

[divyansh42]

/lgtm