test(event): fix EventPluginLoader singleton pollution between tests

FilterQueryTest.testMatchFilter() sets filterQuery={fromBlock=100,
toBlock=190} on the EventPluginLoader singleton with no cleanup.
With forkEvery=100, tests sharing the same JVM inherit this stale
state, causing matchFilter() to return false for block 1 and
skipping processTrigger() entirely (0/293 instructions covered).

Add @after teardown in FilterQueryTest to reset filterQuery to null,
and add a defensive reset in BlockEventGetTest.@before as a guard
against any other preceding test leaving dirty singleton state.

Author: warku123

framework/src/test/java/org/tron/common/logsfilter/FilterQueryTest.java

@@ -17,6 +17,7 @@
 import java.util.List;
 import java.util.Map;
 import lombok.extern.slf4j.Slf4j;
+import org.junit.After;
 import org.junit.Assert;
 import org.junit.Test;
 import org.tron.common.logsfilter.capsule.ContractEventTriggerCapsule;
@@ -28,6 +29,11 @@
 @Slf4j
 public class FilterQueryTest {
 
+  @After
+  public void tearDown() {
+    EventPluginLoader.getInstance().setFilterQuery(null);
+  }
+
   @Test
   public synchronized void testParseFilterQueryBlockNumber() {
     assertEquals(LATEST_BLOCK_NUM, parseToBlockNumber(EMPTY));

framework/src/test/java/org/tron/core/event/BlockEventGetTest.java

@@ -90,6 +90,7 @@ public static void init() {
 
   @Before
   public void before() throws IOException {
+    EventPluginLoader.getInstance().setFilterQuery(null);
     Args.getInstance().setNodeListenPort(10000 + port.incrementAndGet());
 
     dbManager = context.getBean(Manager.class);