Update reference to follow 'fixes' to unchecked StatusCode in Rec!1990

added Build all-slots cleanup testing labels

changed title from Update reference to follow 'fixes' to untested StatusCode in Rec!1990 (merged) to Update reference to follow 'fixes' to unchecked StatusCode in Rec!1990 (merged)

• [2020-03-13 00:11] Validation started with lhcb-run2-patches#688
• [2020-03-13 00:14] Validation started with lhcb-run2-patches-dev4#264

removed all-slots label

merged

mentioned in commit 838f70bc