feat(plugins-portlet): migrate OSGi Plugins portlet from Dojo to Angular #34732

[hmoreras]

Proposed Changes

Migrates the legacy Dojo/JSP-based OSGi Plugins portlet (dynamic-plugins) to a fully Angular implementation.

Frontend — new libs/portlets/dot-plugins library

• DotOsgiService (libs/data-access) — typed HTTP client for all /api/v1/osgi endpoints: list, upload, deploy/undeploy, start/stop, process exports, extra packages, restart
• DotPluginsListStore — NgRx signals store managing bundle list state with loading / refreshing / loaded / error / restarting transitions; subscribes to OSGI_FRAMEWORK_RESTART and OSGI_BUNDLES_LOADED WebSocket events for cluster-wide real-time sync
• DotPluginsListComponent — data table combining installed bundles + undeployed JARs; drag-and-drop JAR upload (with nested dragenter counter); context menu per row (start/stop/undeploy/process-exports/add-to-bundle); toolbar with search, refresh, extra packages, and OSGi restart
• DotPluginsUploadComponent — dialog with PrimeNG FileUpload dropzone for uploading one or more JAR files
• DotPluginsExtraPackagesComponent — dialog to edit or reset the OSGi exported packages list
• Route registered at plugins path in app.routes.ts with MenuGuardService

Backend

• Renamed portlet dynamic-plugins → plugins-legacy in portlet.xml; new Angular portlet plugins registered alongside it
• PortletID.PLUGINS and PortletID.PLUGINS_LEGACY added to the enum
• Task260320AddPluginsPortletToMenu — runonce upgrade task that replaces plugins-legacy (formerly dynamic-plugins) in all layouts with the new Angular plugins portlet; plugins-legacy is removed from the sidebar but remains registered in portlet.xml and can be re-added manually if needed; clears layout cache
• 58 i18n keys added to Language.properties

Checklist

• Tests — unit tests for store, all three components, and DotOsgiService
• Translations — English keys added; translations for other locales pending
• Security Implications Contemplated — OSGi restart and undeploy are privileged, cluster-wide operations; the portlet is protected by MenuGuardService. No new REST endpoints introduced; existing /api/v1/osgi endpoints are used.

Additional Info

• The legacy portlet (plugins-legacy) is removed from all layouts so it no longer appears in the sidebar; it remains registered in portlet.xml and can be added back manually if needed.
• The OSGI_BUNDLES_LOADED WebSocket event is debounced 5 s to avoid rapid-fire reloads during bundle resolution after a restart.
• Undeployed JARs (files present in the deploy folder but not yet installed) are surfaced as a distinct row type (state: 'undeployed') with a single Deploy action.

Screenshots

Original	Updated

This PR fixes: #34732