Remove FileStager - run2-patches

Backport of !4362 (merged)

added all-slots cleanup legacy labels

• [2024-02-07 00:04] Validation started with lhcb-run2-gaudi-head#700
• [2024-02-07 00:04] Validation started with lhcb-run2-patches-dev4#1689
• [2024-02-07 00:04] Validation started with lhcb-run2-patches#1465
• [2024-02-08 00:03] Validation started with lhcb-run2-patches#1466
• [2024-02-09 00:12] Validation started with lhcb-run2-gaudi-head#701
• [2024-02-09 00:12] Validation started with lhcb-run2-patches#1467
• [2024-02-10 00:03] Validation started with lhcb-run2-gaudi-head#702
• [2024-02-10 00:03] Validation started with lhcb-run2-patches#1468
• [2024-02-11 00:03] Validation started with lhcb-run2-patches-dev4#1690
• [2024-02-12 00:03] Validation started with lhcb-run2-patches#1469
• [2024-02-12 00:03] Validation started with lhcb-run2-gaudi-head#703
• [2024-02-13 00:03] Validation started with lhcb-run2-gaudi-head#704
• [2024-02-13 00:03] Validation started with lhcb-run2-patches#1470
• [2024-02-14 00:11] Validation started with lhcb-run2-gaudi-head#705
• [2024-02-14 00:11] Validation started with lhcb-run2-patches#1471
• [2024-02-15 00:11] Validation started with lhcb-run2-gaudi-head#706
• [2024-02-15 00:12] Validation started with lhcb-run2-patches#1472

mentioned in commit cce86b49

merged