Ledger.reset should reset containsRemoval status (#10338)

Author: dougqh

internal-api/src/main/java/datadog/trace/api/TagMap.java

@@ -995,6 +995,7 @@ Entry findLastEntry(String tag) {
     public void reset() {
       Arrays.fill(this.entryChanges, null);
       this.nextPos = 0;
+      this.containsRemovals = false;
     }
 
     @Override

internal-api/src/test/java/datadog/trace/api/TagMapLedgerTest.java

@@ -201,6 +201,8 @@ public void buildWithRemoves() {
       ledger.remove(key(i));
     }
 
+    assertTrue(ledger.containsRemovals());
+
     TagMap map = ledger.build();
     for (int i = 0; i < SIZE; ++i) {
       if ((i % 2) == 0) {
@@ -209,6 +211,10 @@ public void buildWithRemoves() {
         assertEquals(value(i), map.getString(key(i)));
       }
     }
+
+    ledger.reset();
+
+    assertFalse(ledger.containsRemovals());
   }
 
   @Test
@@ -218,6 +224,10 @@ public void smartRemoval_existingCase() {
     ledger.smartRemove("foo");
 
     assertTrue(ledger.containsRemovals());
+
+    ledger.reset();
+
+    assertFalse(ledger.containsRemovals());
   }
 
   @Test
@@ -226,6 +236,10 @@ public void smartRemoval_missingCase() {
     ledger.smartRemove("foo");
 
     assertFalse(ledger.containsRemovals());
+
+    ledger.reset();
+
+    assertFalse(ledger.containsRemovals());
   }
 
   @Test