[REF] start unravelling the way we retrieve the saved search

We have 3 types of saved searches
- search kit
- legacy core searches
- legacy custom searches

The only information these 3 need to load is the savedSearch details and
the group ID (to add in the add & exclude). The wrangling of the params should
happen in the getSql functions - which we can think about being in a listener once
they have standard inputs & outputs. However, to get to that point
we want to standardise those inputs & outputs. This removes
only point of randomness - ie savedSearch has a consistent value & the wrangling
of what is in it is pushed closer to the relevant functions

CRM/Contact/BAO/GroupContactCache.php

@@ -796,7 +796,10 @@ private static function updateCacheFromTempTable(CRM_Utils_SQL_TempTable $groupC
    */
   protected static function insertGroupContactsIntoTempTable(string $tempTableName, int $groupID, ?int $savedSearchID, ?string $children): void {
     if ($savedSearchID) {
-      $ssParams = CRM_Contact_BAO_SavedSearch::getSearchParams($savedSearchID);
+      $savedSearch = \Civi\Api4\SavedSearch::get(FALSE)
+        ->addWhere('id', '=', $savedSearchID)
+        ->execute()
+        ->first();
 
       $excludeClause = "NOT IN (
                         SELECT contact_id FROM civicrm_group_contact
@@ -805,9 +808,21 @@ protected static function insertGroupContactsIntoTempTable(string $tempTableName
       $addSelect = "$groupID AS group_id";
 
       if (!empty($ssParams['api_entity'])) {
-        $sql = self::getApiSQL($ssParams, $addSelect, $excludeClause);
+        $sql = self::getApiSQL($savedSearch, $addSelect, $excludeClause);
       }
       else {
+        $fv = CRM_Contact_BAO_SavedSearch::getFormValues($savedSearchID);
+        //check if the saved search has mapping id
+        if ($savedSearch['mapping_id']) {
+          $ssParams = CRM_Core_BAO_Mapping::formattedFields($fv);
+        }
+        elseif (!empty($fv['customSearchID'])) {
+          $ssParams = $fv;
+        }
+        else {
+          $ssParams = CRM_Contact_BAO_Query::convertFormValues($fv);
+        }
+
         // CRM-7021 rectify params to what proximity search expects if there is a value for prox_distance
         if (!empty($ssParams)) {
           CRM_Contact_BAO_ProximityQuery::fixInputParams($ssParams);