Trigger queue cleaner sequentially (#14)

* added option to run queue cleaner after content blocker

* updated readme to clearly state what the jobs do

code/Common/Configuration/QueueCleaner/QueueCleanerConfig.cs

@@ -5,6 +5,8 @@ public sealed record QueueCleanerConfig : IJobConfig
     public const string SectionName = "QueueCleaner";
     
     public required bool Enabled { get; init; }
+    
+    public required bool RunSequentially { get; init; }
 
     public void Validate()
     {