Use the tool plugin to include photon-targeting into photon-core (#2137)

## Description

This allows photon-targeting to be loaded using the same mechanism as
the rest of the WPILib libraries, fixing issues with libraries not being
able to find and load their dependent libraries.

## Meta

Merge checklist:
- [x] Pull Request title is [short, imperative
summary](https://cbea.ms/git-commit/) of proposed changes
- [x] The description documents the _what_ and _why_
- [x] If this PR changes behavior or adds a feature, user documentation
is updated
- [ ] If this PR touches photon-serde, all messages have been
regenerated and hashes have not changed unexpectedly
- [ ] If this PR touches configuration, this is backwards compatible
with settings back to v2025.3.2
- [ ] If this PR touches pipeline settings or anything related to data
exchange, the frontend typing is updated
- [ ] If this PR addresses a bug, a regression test for it is added

photon-targeting/src/test/java/jni/CscoreExtrasTest.java

@@ -28,23 +28,21 @@ import edu.wpi.first.cscore.UsbCamera;
 import edu.wpi.first.hal.HAL;
 import edu.wpi.first.util.PixelFormat;
 import edu.wpi.first.util.RawFrame;
+import edu.wpi.first.util.RuntimeLoader;
 import java.io.IOException;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.opencv.core.Mat;
 import org.photonvision.jni.CscoreExtras;
-import org.photonvision.jni.PhotonTargetingJniLoader;
-import org.photonvision.jni.WpilibLoader;
+import org.photonvision.jni.LibraryLoader;
 
 public class CscoreExtrasTest {
     @BeforeAll
-    public static void load_wpilib() throws UnsatisfiedLinkError, IOException {
-        if (!WpilibLoader.loadLibraries()) {
-            fail();
-        }
-        if (!PhotonTargetingJniLoader.load()) {
+    public static void load() throws IOException {
+        if (!LibraryLoader.loadWpiLibraries()) {
             fail();
         }
+        RuntimeLoader.loadLibrary("photontargetingJNI");
 
         HAL.initialize(1000, 0);
     }