Adds the capability to retrieve a property field by name (#30859)

* Adds the capability to retrieve a property field by name

Allows to retrieve a property field by name and groupID. As the name
is only unique within the context of a group, and we can have multiple
fields with the same name in the store, for this method the groupID is
directly included in the query instead of being an optional field.

* Adds the targetID parameter to correctly filter fields

* Ensure the method only retrieves non-deleted fields

---------

Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/properties/property_field.go

@@ -21,6 +21,10 @@ func (ps *PropertyService) GetPropertyFields(groupID string, ids []string) ([]*m
 	return ps.fieldStore.GetMany(groupID, ids)
 }
 
+func (ps *PropertyService) GetPropertyFieldByName(groupID, targetID, name string) (*model.PropertyField, error) {
+	return ps.fieldStore.GetFieldByName(groupID, targetID, name)
+}
+
 func (ps *PropertyService) CountActivePropertyFieldsForGroup(groupID string) (int64, error) {
 	return ps.fieldStore.CountForGroup(groupID, false)
 }