[platform UI][se] IJPL-227258 Reset freezer on list invalidation

..., so the new upcoming results would be sorted appropriately.
+ added a short throttling in case of all the essential providers are finished. That helps to avoid blinking when essential providers don't have results, but non-essential Text and Actions generate same results in consequent search requests.

GitOrigin-RevId: cc27304a979d93285e098007c0c28aeee4ed6121

platform/searchEverywhere/frontend/src/ui/SeResultListModel.kt

@@ -46,6 +46,7 @@ class SeResultListModel(private val searchStatePublisher: SeSearchStatePublisher
     SeLog.log(SeLog.THROTTLING) { "Will invalidate result list model" }
     _isValidState.value = false
     isValidAndHasOnlySemantic = false
+    freezer.reset()
   }
 
   fun removeLoadingItem() {

platform/searchEverywhere/frontend/src/vm/SeTabVm.kt

@@ -363,7 +363,7 @@ private fun Flow<SeResultEvent>.throttleUntilEssentialsArrive(essentialProviderI
       }
     }
 
-    return@throttledWithAccumulation if (essentialProvidersCounts.isEmpty()) 0
+    return@throttledWithAccumulation if (essentialProvidersCounts.isEmpty()) ESSENTIALS_THROTTLE_DELAY
     else if (essentialProvidersCounts.values.all { it >= ESSENTIALS_ENOUGH_COUNT }) 0
     else if (essentialProvidersCounts.values.all { it > 0 }) ESSENTIALS_THROTTLE_DELAY
     else null