fix(webconnectivity@v0.5): fetch HTTP only using system-resolver addrs (#935)

While there, change the emoji logger to emit whitespace on info logs. This makes warnings stand out even more.

Closes https://github.com/ooni/probe/issues/2258

internal/logx/logx.go

@@ -45,7 +45,7 @@ func (h *Handler) HandleLog(e *log.Entry) (err error) {
 		case log.DebugLevel:
 			level = "🧐"
 		case log.InfoLevel:
-			level = "🗒️"
+			level = "  "
 		case log.WarnLevel:
 			level = "🔥"
 		default:

internal/logx/logx_test.go

@@ -74,7 +74,7 @@ func TestLogHandlerHandleLog(t *testing.T) {
 		Name:           "info level with emoji",
 		Emoji:          true,
 		Level:          log.InfoLevel,
-		ExpectSeverity: "🗒️",
+		ExpectSeverity: "  ",
 	}, {
 		Name:           "warn level with emoji",
 		Emoji:          true,