sweep various CP algorithm updates from master to 21.2

Merged Nils Erik Krumnack requested to merge krumnack/athena:cp_alg_sweep into 21.2

I hope this is the full collection of all MRs for which the automatic sweep failed: !56201 (merged) !56285 (merged) !56355 (merged) !57294 (merged) !56155 (merged) !57994 (merged) !57676 (merged)

Marking this as draft, as I haven't actually tested it yet.

cc @tadej @jburr

Edited by Nils Erik Krumnack

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