Refactor `.utc.iso8601(3)` to a single method
The following discussion from !25086 (merged) should be addressed:
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@.luke started a discussion: (+3 comments) Non-blocking: I notice that we cast times/datetimes to
.utc.iso8601(3)
9 times within our logging classes. Would it be valuable if we added a single method for doing this, and refactored the 9 instances of this to use that method, as a follow-up MR?