feat(greenhouse): add release name to plugin instance detail page

[guoda-puidokaite]

Summary

Added release name to plugin instance detail page, as in ACs.

Related Issues

Fixes #1608

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have made corresponding changes to the documentation (if applicable).
• My changes generate no new warnings or errors.
• I have created a changeset for my changes.

PR Manifesto

Review the PR Manifesto for best practises.

[changeset-bot]

🦋 Changeset detected

Latest commit: fe79426

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cloudoperators/juno-app-greenhouse	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[Copilot]

Pull request overview

Adds Helm release name visibility to the Greenhouse admin Plugin Instance detail view, improving operational clarity when inspecting deployed plugin instances.

Changes:

• Display spec.releaseName on the plugin instance detail “Details” grid.
• Standardize several detail fields to show a fallback placeholder when values are missing.
• Add a changeset bumping @cloudoperators/juno-app-greenhouse (minor) for the UI enhancement.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
apps/greenhouse/src/components/admin/PluginInstanceDetail/Overview/Details.tsx	Adds “Release Name” row and introduces -- fallbacks for several fields in the details grid.
.changeset/giant-shrimps-happen.md	Declares a minor version bump and notes the new release-name visibility on the detail page.