22.0 yet more Muon ca sync fixes 18

Edward Moyserequested to merge
emoyse/athena:22.0_yet_more_CA_sync_fixes_18 into 22.0

(copied from !58235 (closed))

This should not be merged before !58199 (merged) (I reverted my own fix for that of @tstreble 's, which is better anyway )

It's another round of CA sync changes. As usual, it will not run in production.

In my local q449 test, this removes the SlowMuon differences.

Py:diff-root         INFO comparing [2953] leaves over entries...
Py:diff-root         INFO Found [8027856] identical leaves
Py:diff-root         INFO Found [0] different leaves
Py:diff-root         INFO all good.

🙃

(To be clear, this is after !58199 (merged) is merged - hopefully I won't pick up a conflict since I cherry-picked, but the subsequent rebase means I may).

cc @elmsheus @jcatmore @mhodgkin

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