Add slash command /pr:open to list open PRs with useful information

[jhuttana]

Adds a new Claude Code slash command that provides an interactive way to
list and filter pull requests in the repository using the GitHub CLI.

Features:

• List open/closed/merged/all PRs
• Filter by author, assignee, or labels
• Customize result limit
• Display PR number, title, author, status, labels, and last updated

The command wraps 'gh pr list' with a user-friendly interface, making it
easier to review PRs during development workflows.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[jhuttana]

/assign @rioliu-rh @tomasdavidorg

[tomasdavidorg]

I'm not sure this brings any additional value. It's essentially another layer that wraps gh pr list, which already supports all these filters out of the
box:

gh pr list --author @me --label bug --limit 10

Our existing /pr:approve and /pr:lgtm commands make sense because they add automation (posting comments), but this just duplicates functionality that's already readily available.

[rioliu-rh]

TBH, cc can recognize gh cli and collaborate with it perfectly. I don't think we need this wrapper cmd

[jhuttana]

@tomasdavidorg and @rioliu-rh : Just a finding, looks like even the current PR commands (/pr:lgtm and /pr:approve) are just thin wrappers around "gh pr comment", which doesn't add much value since users can just run gh pr comment --body "/lgtm" directly.

[rioliu-rh]

@tomasdavidorg and @rioliu-rh : Just a finding, looks like even the current PR commands (/pr:lgtm and /pr:approve) are just thin wrappers around "gh pr comment", which doesn't add much value since users can just run gh pr comment --body "/lgtm" directly.

because AI agent does not know how to use our CI plugin. it only can add label for a PR with option --add-label. e.g. gh pr edit 123 --add-label lgtm, but we need to add label via comment instead. the commands can be used with builtin cmd /review pr# (if the pr# is not provided, it can help us list all the opened PRs ), if the code review looks good, then trigger custom slash cmd /pr:lgtm or /pr:approve directly to approve the PR, it's convenient to make PR review process more efficient

[openshift-ci]

@jhuttana: all tests passed!

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