[7.x] Fix bug when formatting epoch dates (#73955) #74139
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Date based aggregations accept a timezone, which gets applied to both the bucketing logic and the formatter. This is usually what you want, but in the case of date formats where a timezone doesn't make any sense, it can create problems. In particular, our formatting logic and our parsing logic were doing different things for epoch_second and epoch_millis formats with time zones. This led to a problem on composite where we'd return an after key for the last bucket that would parse to a time before the last bucket, so instead of correctly returning an empty response to indicate the end of the aggregation, we'd keep returning the same last page of data.
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Backports the following commits to 7.x: