Remove dead --keywords/-k flag from kpt fn eval

[aravindtga]

Description

• What changed: Removed the orphaned --keywords/-k flag from kpt fn eval, its Keywords []string struct field, and the unused GetKeywordsFromFlag() helper. Updated the namespace-provisioning-cli guide to remove stale --keywords references.
• Why it's needed: The flag was left behind as dead code when Complete transfer of kpt updates from Porch to kpt #4355 removed the Porch dependency from kpt. It was originally introduced in feat: Kpt CLI Function discovery #2980 for shell tab-completion only (filtering Porch function catalog suggestions via SuggestFunctions() and SuggestKeywords()). The flag was never consumed at runtime and passing it had no effect on function execution.
• How it works: Removes the flag registration, struct field, and helper function. No behavioral change other than the flag no longer appearing in kpt fn eval --help.

Type of Change

• Refactor
• Documentation

Checklist

• Code follows project style guidelines
• Self-reviewed changes
• Tests added/updated
• Documentation added/updated
• All tests and gating checks pass

AI Disclosure

• I have used AI in the creation of this PR.

If so, please describe how:
- Kiro to analyse the flag's history, and generate the PR message.

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[Copilot]

Pull request overview

This PR removes an unused --keywords/-k flag from kpt fn eval (and its associated plumbing) after the earlier Porch-dependency removal, and updates documentation to eliminate stale references.

Changes:

• Removed the --keywords/-k flag registration and Keywords []string field from the kpt fn eval command runner.
• Deleted the unused GetKeywordsFromFlag() helper from pkg/lib/util/cmdutil.
• Updated the namespace provisioning CLI guide to remove --keywords from the autocomplete walkthrough and example command.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
thirdparty/cmdconfig/commands/cmdeval/cmdeval.go	Drops the dead --keywords/-k flag and runner field from kpt fn eval.
pkg/lib/util/cmdutil/cmdutil.go	Removes the unused GetKeywordsFromFlag() helper.
documentation/content/en/guides/namespace-provisioning-cli.md	Removes stale --keywords references from the guide and example command.

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