[release/9.2]: Ensure visible trace spans stay sorted by start time #8785
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Backport of #8771 to release/9.2
Customer Impact
This PR changes the dashboard trace detail data provider to replace an unordered data structure with an ordered one w/comparer to ensure that span ordering by time is preserved.
Testing
A unit test has been added and a diff is included in the original PR if manual testing is desired as well.
Risk
This is a small, isolated, tested change where the root cause is well understood.
Regression?
Yes