Bump extractor init timeout to 60s (#11598)

I’ve seen this timeout at 30s on CI under load.

changelog_begin
changelog_end

extractor/src/test/lib/scala/com/digitalasset/extractor/services/ExtractorFixture.scala

@@ -121,7 +121,7 @@ trait ExtractorFixture extends SandboxParticipantFixture with PostgresAroundSuit
         try {
           val (dar, _) = readDar(darFile)
           val result = participantClients().flatMap(run(_, init, dar = dar)(ec))(ec)
-          val _ = Await.result(result, atMost = 30.seconds)
+          val _ = Await.result(result, atMost = 60.seconds)
         } finally {
           ec.shutdown()
         }