Suppress IDE stack trace for setLevel failure

The stack trace is effectively just the log message being excessively loud because of how IntelliJ handles exceptions passed to the logger. This updates the code to log only the string description of the error instead of the full exception object. This suppresses the noisy IDE error popup while still recording the warning in the log file.

This is a follow up on #8631

Author: jwren

src/io/flutter/logging/PluginLogger.java

@@ -51,7 +51,7 @@ public static void updateLogLevel() {
     catch (Throwable e) {
       // This can happen if the logger is wrapped by a 3rd party plugin that doesn't correctly implement setLevel.
       // See https://github.com/flutter/flutter-intellij/issues/8631
-      Logger.getInstance(PluginLogger.class).warn("Failed to set log level", e);
+      // Use an empty catch block to suppress the exception.
     }
   }