[MM-38216] Add API endpoint and adapt search to allow multi-team search (#18371)

* Add API endpoint and adapt search to allow multi-team search

* Refactor handler, refactor sql query to use squirrel, rename app and store functions and add tests

* Fix lint

* Fix search engines and remove unneeded comments

* Fix test

* Remove user from channel after test

store/retrylayer/retrylayer.go

@@ -6190,11 +6190,11 @@ func (s *RetryLayerPostStore) Search(teamID string, userID string, params *model
 
 }
 
-func (s *RetryLayerPostStore) SearchPostsInTeamForUser(paramsList []*model.SearchParams, userID string, teamID string, page int, perPage int) (*model.PostSearchResults, error) {
+func (s *RetryLayerPostStore) SearchPostsForUser(paramsList []*model.SearchParams, userID string, teamID string, page int, perPage int) (*model.PostSearchResults, error) {
 
 	tries := 0
 	for {
-		result, err := s.PostStore.SearchPostsInTeamForUser(paramsList, userID, teamID, page, perPage)
+		result, err := s.PostStore.SearchPostsForUser(paramsList, userID, teamID, page, perPage)
 		if err == nil {
 			return result, nil
 		}