add ability to deep scan just a single tv show for Plex, Emby, and Jellyfin (#2318)

* add ability to deep scan just a single tv show for Plex, Emby, and Jellyfin

Including "/api/libraries/{id:int}/scan-show" REST API endpoint to
trigger.

* restrict plex search results to the intended library

* restrict scanning to media server libraries that are marked to sync with etv

* fix previous commit

* also guard library scan api

* add scan buttons to show ui

* scan single plex show by id

* scan jellyfin and emby single shows by id

* update changelog

---------

Co-authored-by: Jeff Slutter <MrMustard@gmail.com>
Co-authored-by: Jason Dove <1695733+jasongdove@users.noreply.github.com>

ErsatzTV.Application/Libraries/Commands/QueueLibraryScanByLibraryIdHandler.cs

@@ -29,6 +29,20 @@ public class QueueLibraryScanByLibraryIdHandler(
 
         foreach (Library library in maybeLibrary)
         {
+            bool shouldSyncItems = library switch
+            {
+                PlexLibrary plexLibrary => plexLibrary.ShouldSyncItems,
+                JellyfinLibrary jellyfinLibrary => jellyfinLibrary.ShouldSyncItems,
+                EmbyLibrary embyLibrary => embyLibrary.ShouldSyncItems,
+                _ => true
+            };
+
+            if (!shouldSyncItems)
+            {
+                logger.LogWarning("Library sync is disabled for library id {Id}", library.Id);
+                return false;
+            }
+
             if (locker.LockLibrary(library.Id))
             {
                 logger.LogDebug("Queued library scan for library id {Id}", library.Id);