chore: archive - move error to trace level when insert row fails (#2283)

* archive: move error to trace level when insert row fails

That is helpful to prevent the node to spam the logs when it shares
connection to the same Postgres database with other nodes, in
which case the following log appears too much:

topics="waku archive" tid=1 file=archive.nim:113 err="error in
runStmt: error in dbConnQueryPrepared calling waitQueryToFinish: error
in query: ERROR: duplicate key value violates unique constraint
"messageindex" DETAIL: Key
(messagehash)=(88f4ee115eef6f233a7dceaf975f03946e18666adda877e38d61be98add934e8)
already exists. "

waku/waku_archive/archive.nim

@@ -112,7 +112,10 @@ proc handleMessage*(w: WakuArchive,
 
     let putRes = await w.driver.put(pubsubTopic, msg, msgDigest, msgHash, msgReceivedTime)
     if putRes.isErr():
-      error "failed to insert message", err=putRes.error
+      if "duplicate key value violates unique constraint" in putRes.error:
+        trace "failed to insert message", err=putRes.error
+      else:
+        debug "failed to insert message", err=putRes.error
       waku_archive_errors.inc(labelValues = [insertFailure])
 
   let insertDuration = getTime().toUnixFloat() - insertStartTime