Geo: Add container registry sync test for missing config
What does this MR do and why?
Follow up for !153914 (comment 1926896198):
question (non-blocking) I am wondering if it would be hard to write a test to cover the case of this error bubbling up to
last_sync_failure
?
This MR adds such a test.
It also refactors the code a tiny bit.
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Edited by Michael Kozono