[PTRun]Fix cutting off and using previous input (#19215)

* Deselect previous selected item because it might not be valid.

* fast execute non-delayed queries

* Speling fixxes.

* Fixed _isTextSetProgrammatically check for when PTRSearchQueryFastResultsWithDelay = false

* Resoved some comments.

* Added partial delay for fast plugins

* Updates settings UI for second throttle value. Changed text.

* 'Verbiage' update

src/settings-ui/Settings.UI.Library/PowerLauncherProperties.cs

@@ -57,6 +57,9 @@ namespace Microsoft.PowerToys.Settings.UI.Library
         [JsonPropertyName("search_input_delay")]
         public int SearchInputDelay { get; set; }
 
+        [JsonPropertyName("search_input_delay_fast")]
+        public int SearchInputDelayFast { get; set; }
+
         [JsonPropertyName("search_clicked_item_weight")]
         public int SearchClickedItemWeight { get; set; }