test(apollo): Cover request header filtering in Apollo 4

Verify that Apollo 4 applies configured Data Collection deny-list behavior to captured request headers across both supported execution paths.

Refs #5666

Co-Authored-By: Claude <noreply@anthropic.com>

Author: adinauer

sentry-apollo-4/src/test/java/io/sentry/apollo4/SentryApollo4BuilderExtensionsClientErrorsTest.kt

@@ -356,6 +356,23 @@ abstract class SentryApollo4BuilderExtensionsClientErrorsTest(
       )
   }
 
+  @Test
+  fun `data collection filters request headers`() {
+    val sut =
+      fixture.getSut(responseBody = fixture.responseBodyNotOk) {
+        dataCollection.httpHeaders.request = KeyValueCollectionBehavior.denyList("accept")
+      }
+    executeQuery(sut)
+
+    verify(fixture.scopes)
+      .captureEvent(
+        check {
+          assertEquals("[Filtered]", it.request!!.headers?.get("Accept"))
+        },
+        any<Hint>(),
+      )
+  }
+
   @Test
   fun `data collection can disable request headers`() {
     val sut =