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JS-generated timestamps have no hover, only displays readable time

Description

JS-generated timestamps have no hover, only displays readable time

Get rid of all time-ago-only hackery, which was likely a remnant of when
we did timestamps differently.

The only place time-ago-only was still in use was for auto-updating the
readable timestamp (so that when you're on a page, it keeps updating the
timestamp as time passes). Since we use a library for that, there's no
need to keep pushing that through .timestamp, which in that case returns
something way different (just readable timestamp) then it usually does
(full HTML for both readable & full timestamp)

CSS still assumed we only have 1 timestamp in no-JS when in fact we
generate both readable & full timestamp, so the hover-effect should work
there too.

Fixes T84858
Fixes T86852

Bug: T84858
Bug: T86852
Change-Id: I7abfddf3cecb7cd55fd55a164dabdf4480f0e83b