[JENKINS-75136] Show 'Unprotected URLs' description

[apuig]

See JENKINS-75136.

Testing done

<div class="jenkins-form-description">These URLs (and URLs starting with these prefixes plus a /) should require no authentication. If possible, configure your container to pass these requests straight to Jenkins without requiring login.</div>

Proposed changelog entries

• Show 'Unprotected URLs' description

Proposed upgrade guidelines

N/A

Submitter checklist

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1. The Jira issue, if it exists, is well-described.
2. The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see examples). Fill in the Proposed upgrade guidelines section only if there are breaking changes or changes that may require extra steps from users during upgrade.
3. There is automated testing or an explanation as to why this change has no tests.
4. New public classes, fields, and methods are annotated with @Restricted or have @since TODO Javadocs, as appropriate.
5. New deprecations are annotated with @Deprecated(since = "TODO") or @Deprecated(forRemoval = true, since = "TODO"), if applicable.
6. New or substantially changed JavaScript is not defined inline and does not call eval to ease future introduction of Content Security Policy (CSP) directives (see documentation).
7. For dependency updates, there are links to external changelogs and, if possible, full differentials.
8. For new APIs and extension points, there is a link to at least one consumer.

Desired reviewers

@mention

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

Maintainer checklist

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1. There are at least two (2) approvals for the pull request and no outstanding requests for change.
2. Conversations in the pull request are over, or it is explicit that a reviewer is not blocking the change.
3. Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
4. Proper changelog labels are set so that the changelog can be generated automatically.
5. 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).
6. If it would make sense to backport the change to LTS, a Jira issue must exist, be a Bug or Improvement, and be labeled as lts-candidate to be considered (see query).

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[daniel-beck]

Show 'Unprotected URLs' description

I don't think this change needs to be documented in the changelog. That said, as general advice: this proposed changelog entry is not very helpful for readers lacking the context of this PR. Changelog entries should be able to stand by themselves. So something like "in the inline description of the Whatever security realm" at a minimum would be useful here.

[daniel-beck]

/label ready-for-merge

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This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.

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