fix(probeservices): use api.ooni.io (#926)

See https://github.com/ooni/probe/issues/2147.

Note that this PR also tries to reduce usage of legacy names inside unit/integration tests.

internal/cmd/jafar/tlsproxy/tlsproxy_test.go

@@ -21,7 +21,7 @@ func TestPass(t *testing.T) {
 func TestBlock(t *testing.T) {
 	listener := newproxy(t, "ooni.io")
 	checkdialtls(t, listener.Addr().String(), false, &tls.Config{
-		ServerName: "mia-ps.ooni.io",
+		ServerName: "api.ooni.io",
 	})
 	killproxy(t, listener)
 }