Redirect PluginWrapper root URL to third-party licenses view

[somiljain2006]

Fixes ~#16812

Redirect requests to the PluginWrapper root URL (/plugin//wrapper/) to the thirdPartyLicenses view. This fixes a 404 error encountered when clicking the plugin name on the "License and dependency information" page.

Testing done

Ensured all tests still passed.

Screenshots (UI changes only)

Before

After

Proposed changelog entries

Fix a 404 error when clicking plugin names on the “License and dependency information for plugins” page.

Proposed changelog category

/label bug

Proposed upgrade guidelines

N/A

Before the changes are marked as ready-for-merge:

Maintainer checklist

• There are at least two (2) approvals for the pull request and no outstanding requests for change.
• Conversations in the pull request are over, or it is explicit that a reviewer is not blocking the change.
• Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
• Proper changelog labels are set so that the changelog can be generated automatically.
• If the change needs additional upgrade steps from users, the upgrade-guide-needed label is set, and there is a Proposed upgrade guidelines section in the pull request title (see example).
• If it would make sense to backport the change to LTS, be a Bug or Improvement, and either the issue or pull request must be labeled as lts-candidate to be considered.

Desired reviewers

@jenkinsci/core-pr-reviewers, @daniel-beck, @MarkEWaite, @strangelookingnerd

[Copilot]

Pull request overview

This PR fixes a 404 error encountered when clicking plugin names on the "License and dependency information for plugins" page by redirecting requests to the PluginWrapper root URL to the thirdPartyLicenses view.

Changes:

• Added an index.jelly redirect file that forwards users from /plugin/<name>/wrapper/ to /plugin/<name>/wrapper/thirdPartyLicenses

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[somiljain2006]

@MarkEWaite, I have done the required changes. Can you please review it?

[daniel-beck]

Works as expected in local testing. What used to be 404 is now redirecting to the page you're likely already on.

/plugin/…/wrapper/uninstall is redirecting here as well, but that seems acceptable.

[MarkEWaite]

This PR is now ready for merge. We will merge it after approximately 24 hours if there is no negative feedback.

/label ready-for-merge

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