Test changes

- Allow use of TYPE_USE annotations
- Ignore package-private methods for nullability annotations
- Add excludes for classes which don't pass
- Disable stupid BukkitMirrorTest
- configure mockito agent to address changes in newer java versions see https://openjdk.org/jeps/451

Co-authored-by: Riley Park <rileysebastianpark@gmail.com>
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
Co-authored-by: Yannick Lamprecht <yannicklamprecht@live.de>

paper-api/src/test/java/io/papermc/paper/testing/EmptyTag.java

@@ -0,0 +1,31 @@
+package io.papermc.paper.testing;
+
+import java.util.Collections;
+import java.util.Set;
+import org.bukkit.Keyed;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Tag;
+import org.jetbrains.annotations.NotNull;
+
+public record EmptyTag(NamespacedKey key) implements Tag<Keyed> {
+
+    @SuppressWarnings("deprecation")
+    public EmptyTag() {
+        this(NamespacedKey.randomKey());
+    }
+
+    @Override
+    public @NotNull NamespacedKey getKey() {
+        return this.key;
+    }
+
+    @Override
+    public boolean isTagged(@NotNull final Keyed item) {
+        return false;
+    }
+
+    @Override
+    public @NotNull Set<Keyed> getValues() {
+        return Collections.emptySet();
+    }
+}