Adding more spans to understand stats `publish-event!` (#35889)

* Adding more spans to understand stats `publish-event!`

https://stats.metabase.com/dashboard/2117

 still takes 4s to load and
the current spans don't seem to provide fine granularity around the
hot spot, but it seems to be happening in the early stages of
`publish-event!`. These extra spans provide finer granularity.

* Adding what is probably a non-needed span, but we want to over-instrument this, if anything. Once we id the hotspot we can remove what we want.

* add more spans

* remove :object from new spans

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Co-authored-by: Noah Moss <noahbmoss@gmail.com>