fix(ourlogs): resolve received time in the timestamp hover tooltip

[JoshuaKGoldberg]

The "Received" row in the log timestamp hover tooltip spun on a loading indicator forever in the expanded log details.

observed_timestamp is declared with search_type="number" but stored as a string, and LOGS_INTERNAL_TO_PUBLIC_ALIAS_MAPPINGS is keyed by search_type. The trace item details endpoint looks the alias up using the type of the value it actually got back ("string") so it misses the "number"` bucket and falls back to emitting the internal name:

{"name": "sentry.observed_timestamp_nanos", "type": "str", "value": "1786046484244158487"}

The log table row works because it maps that internal name in while merging the prefetched attributes. But the tooltip only read the observed_timestamp alias. The expanded log details key their attribute map by the raw response names, so the lookup missed and the placeholder spinner added in #115505 had nothing to resolve to.

The tooltip now accepts either name. It also stops spinning once the trace item details request has settled, so a log that just misses the attribute no longer leaves a spinner up forever.

Before	After

Closes LOGS-937.

[linear-code]

LOGS-937

[JoshuaKGoldberg]

@cursor review

[JoshuaKGoldberg]

@cursor review

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