feat(users/Profpatsch/whatcd-resolver): log json+ld fetching

This traces the target of a json+ld fetch.

We also simplify the telemetry stuff by using a pseudo-class
`MonadOtel` everywhere.

I wonder if we can get rid of passing the span to `assertM`, because
it’s kind of an antipattern to be honest.

Change-Id: I1448d643c909a29684fa1ae54037177ba2c20639
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11166
Tested-by: BuildkiteCI
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>

users/Profpatsch/my-prelude/src/Postgres/MonadPostgres.hs

@@ -543,11 +543,11 @@ traceQueryIfEnabled tools span logDatabaseQueries qry params = do
         Otel.addAttributes
           span
           $ HashMap.fromList
-          $ ( ("postgres.query", Otel.toAttribute @Text errs.query)
+          $ ( ("_.postgres.query", Otel.toAttribute @Text errs.query)
                 : ( errs.explain
                       & foldMap
                         ( \ex ->
-                            [("postgres.explain", Otel.toAttribute @Text ex)]
+                            [("_.postgres.explain", Otel.toAttribute @Text ex)]
                         )
                   )
             )