Long Running Operations: Ensure eager write lock (#21113)

Use EagerWriteLock for long running operations

Switch from WriteLock to EagerWriteLock when acquiring the lock for
long running operations to ensure proper lock acquisition timing.

Author: lauraneto

src/Umbraco.Core/Services/LongRunningOperationService.cs

@@ -128,7 +128,7 @@ private async Task<Attempt<Guid, LongRunningOperationEnqueueStatus>> RunInner<T>
             {
                 // Acquire a write lock to ensure that no other operations of the same type can be enqueued while this one is being processed.
                 // This is only needed if we do not allow multiple runs of the same type.
-                scope.WriteLock(Constants.Locks.LongRunningOperations);
+                scope.EagerWriteLock(Constants.Locks.LongRunningOperations);
                 if (await IsAlreadyRunning(type))
                 {
                     scope.Complete();