Promote System APIs to also be Test APIs for Content Capture Data

Sharing.

This is to be able to test them with CTS suite.

Bug: 145205247
Test: built Android, CTS is coming.
Change-Id: I28cc804be06ee3adbfd1e139803eed2ab10715ca

core/java/android/service/contentcapture/ContentCaptureService.java

@@ -339,6 +339,7 @@ public abstract class ContentCaptureService extends Service {
      * @hide
      */
     @SystemApi
+    @TestApi
     public void onDataShareRequest(@NonNull DataShareRequest request,
             @NonNull DataShareCallback callback) {
         if (sVerbose) Log.v(TAG, "onDataShareRequest()");

core/java/android/service/contentcapture/DataShareCallback.java

@@ -19,6 +19,7 @@ package android.service.contentcapture;
 import android.annotation.CallbackExecutor;
 import android.annotation.NonNull;
 import android.annotation.SystemApi;
+import android.annotation.TestApi;
 
 import java.util.concurrent.Executor;
 
@@ -32,6 +33,7 @@ import java.util.concurrent.Executor;
  * @hide
  **/
 @SystemApi
+@TestApi
 public interface DataShareCallback {
 
     /** Accept the data share.

core/java/android/service/contentcapture/DataShareReadAdapter.java

@@ -18,6 +18,7 @@ package android.service.contentcapture;
 
 import android.annotation.NonNull;
 import android.annotation.SystemApi;
+import android.annotation.TestApi;
 import android.os.ParcelFileDescriptor;
 
 /**
@@ -27,6 +28,7 @@ import android.os.ParcelFileDescriptor;
  * @hide
  **/
 @SystemApi
+@TestApi
 public interface DataShareReadAdapter {
 
     /**