Correctly reverse failed save search / revamp dim-api tests #10811
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In investigating #10809 I found that there were a number of bugs related to reversing DIM Sync actions if they fail. The one that was causing this user to get stuck was a failed "save search" for a search that was too long - because it threw an error every time, it just kept trying the update. I both fixed the logic and put a protective try/catch around the reverse logic, as it isn't critical.
I then overhauled the tests for the dim-api reducer and added in assertions that reversing actions after a failure would return the state to the initial version, and fixed a handful of related bugs.
Fixes #10809