Fix default monitoring if last alg in control flow does not have producer

Fix for a bug in the default monitoring as reported in https://indico.cern.ch/event/1265442/contributions/5314228/subcontributions/417935/attachments/2712620/4710610/DQreport_12_09_2023.pdf and elsewhere.

The issue was caused by a break in the reverse loop of the control flow, which was triggered by a custom monitor as last algorithm in the control flow.

Also, the monitoring docs are updated and two unused functions in the commissioning settings were removed.

Supersedes !2633 (closed)

requested review from @gciezare

added RTA label

added 3 commits

• 4b23cb62 - [monitoring] do not return empty monitoring algs if last alg in control...
• 372a9f0c - [monitoring doc] update documentation of default monitoring
• cc786f76 - remove unused functions

Compare with previous version

added Monitoring label

assigned to @jagoodin

/ci-test

added ci-test-triggered label

• [2023-09-13 14:58] Validation started with lhcb-master-mr#9193
• [2023-10-05 00:08] Validation started with lhcb-head-2#999
• [2023-10-05 00:41] Validation started with lhcb-head-2#999
• [2023-10-06 00:08] Validation started with lhcb-head-2#1000
• [2023-10-06 00:40] Validation started with lhcb-head-2#1000
• [2023-10-07 00:06] Validation started with lhcb-head-2#1001
• [2023-10-10 00:08] Validation started with lhcb-head-2#1002
• [2023-10-11 00:08] Validation started with lhcb-head-2#1003
• [2023-10-12 00:08] Validation started with lhcb-head-2#1004
• [2023-10-13 00:06] Validation started with lhcb-head-2#1005
• [2023-10-14 00:06] Validation started with lhcb-head-2#1006
• [2023-10-15 00:06] Validation started with lhcb-head-2#1007
• [2023-10-16 10:42] Validation started with lhcb-master-mr#9458
• [2023-10-16 17:39] Validation started with lhcb-master-mr#9466

mentioned in issue #659 (closed)

added backport RTA/2023.08.24 label

assigned to @rmatev and unassigned @jagoodin

added lhcb-head-2 label

resolved all threads

mentioned in merge request !2633 (closed)

added HLT2-PbPb label

mentioned in merge request !2703 (merged)

mentioned in commit Rec@33aa2df9

mentioned in commit MooreOnline@64b537a7

mentioned in merge request Rec!3629 (merged)

mentioned in commit DaVinci@045fca51