MM-23015: Enable or disable group mentions (#14010)

* MM-23015: Enable or disable group mentions + show them in suggestion list


Co-authored-by: Catalin Tomai <catalin.tomai@mattermost.com>

web/params.go

@@ -75,6 +75,7 @@ type Params struct {
 	GroupIDs               string
 	IncludeTotalCount      bool
 	IncludeDeleted         bool
+	FilterAllowReference   bool
 }
 
 func ParamsFromRequest(r *http.Request) *Params {
@@ -277,6 +278,10 @@ func ParamsFromRequest(r *http.Request) *Params {
 	params.NotAssociatedToTeam = query.Get("not_associated_to_team")
 	params.NotAssociatedToChannel = query.Get("not_associated_to_channel")
 
+	if val, err := strconv.ParseBool(query.Get("filter_allow_reference")); err == nil {
+		params.FilterAllowReference = val
+	}
+
 	if val, err := strconv.ParseBool(query.Get("paginate")); err == nil {
 		params.Paginate = &val
 	}