Update instrumentation to avoid making all constructors public

Previously, any constructors instrumented by Robolectric were made public. This
caused two types of issues:

1) If Android classes had non-public constructors which were made public and
added to the Android API, Robolectric allowed tests to incorrectly use the
constructors on older SDK levels (where they were non-public). This most
commonly occurs for AccessibiltyEvent and AccessibilityNodeInfo.

2) When reflection was used to instantiate classes that were instrumented by
Robolectric, all constructors were accessible, which did not match what
happened when running on an Android test.

Update the instrumentation in Robolectric to prevent making all public
constructors.

PiperOrigin-RevId: 510049123

library/core/src/test/java/com/google/android/exoplayer2/mediacodec/AsynchronousMediaCodecCallbackTest.java

@@ -460,6 +460,7 @@ public class AsynchronousMediaCodecCallbackTest {
     Constructor<MediaCodec.CodecException> constructor =
         MediaCodec.CodecException.class.getDeclaredConstructor(
             Integer.TYPE, Integer.TYPE, String.class);
+    constructor.setAccessible(true);
     return constructor.newInstance(
         /* errorCode= */ 0, /* actionCode= */ 0, /* detailMessage= */ "error from codec");
   }