Remove unused method Log.getLogStackTraces

It was impossible to call because it was a non-static method in a class
with a private constructor.

PiperOrigin-RevId: 382504128

library/common/src/main/java/com/google/android/exoplayer2/util/Log.java

@@ -57,12 +57,6 @@ public final class Log {
     return logLevel;
   }
 
-  /** Returns whether stack traces of {@link Throwable}s will be logged to logcat. */
-  @Pure
-  public boolean getLogStackTraces() {
-    return logStackTraces;
-  }
-
   /**
    * Sets the {@link LogLevel} for ExoPlayer logcat logging.
    *