fix: skip ordering-dependent max files limit test for Vert.x HashSet

fileUploads() returns a HashSet in Vert.x so iteration order is JVM-
version-dependent. Add testBodyFilesContentOrdering() flag (defaults
true) to HttpServerTest to allow skipping the specific-file assertion.
Vert.x subclasses return false and add a count-based test instead.

Author: jandro996

dd-java-agent/instrumentation-testing/src/main/groovy/datadog/trace/agent/test/base/HttpServerTest.groovy

@@ -387,6 +387,11 @@ abstract class HttpServerTest<SERVER> extends WithHttpServer<SERVER> {
     false
   }
 
+  /** Override to false when the multipart implementation uses a set with non-deterministic ordering (e.g. HashSet). */
+  boolean testBodyFilesContentOrdering() {
+    true
+  }
+
   boolean testBodyJson() {
     false
   }
@@ -1767,7 +1772,7 @@ abstract class HttpServerTest<SERVER> extends WithHttpServer<SERVER> {
 
   def 'test instrumentation gateway file upload content max files limit'() {
     setup:
-    assumeTrue(testBodyFilesContent())
+    assumeTrue(testBodyFilesContent() && testBodyFilesContentOrdering())
     def maxFilesToInspect = Config.get().getAppSecMaxFileContentCount()
     def bodyBuilder = new MultipartBody.Builder().setType(MultipartBody.FORM)
     (1..maxFilesToInspect + 1).each {

dd-java-agent/instrumentation/vertx/vertx-web/vertx-web-3.4/src/test/groovy/server/VertxHttpServerForkedTest.groovy

@@ -98,8 +98,13 @@ class VertxHttpServerForkedTest extends HttpServerTest<Vertx> {
     true
   }
 
-  // fileUploads() returns a HashSet in Vert.x: override to verify count instead of which specific file is last
-  def 'test instrumentation gateway file upload content max files limit'() {
+  @Override
+  boolean testBodyFilesContentOrdering() {
+    false
+  }
+
+  // fileUploads() returns a HashSet in Vert.x: check count instead of which specific file is excluded
+  def 'test instrumentation gateway file upload content max files limit count'() {
     setup:
     assumeTrue(testBodyFilesContent())
     def maxFilesToInspect = Config.get().getAppSecMaxFileContentCount()

dd-java-agent/instrumentation/vertx/vertx-web/vertx-web-4.0/src/latestDepTest/groovy/server/VertxHttpServerForkedTest.groovy

@@ -93,8 +93,13 @@ class VertxHttpServerForkedTest extends HttpServerTest<Vertx> {
     true
   }
 
-  // fileUploads() returns a HashSet in Vert.x: override to verify count instead of which specific file is last
-  def 'test instrumentation gateway file upload content max files limit'() {
+  @Override
+  boolean testBodyFilesContentOrdering() {
+    false
+  }
+
+  // fileUploads() returns a HashSet in Vert.x: check count instead of which specific file is excluded
+  def 'test instrumentation gateway file upload content max files limit count'() {
     setup:
     assumeTrue(testBodyFilesContent())
     def maxFilesToInspect = Config.get().getAppSecMaxFileContentCount()

dd-java-agent/instrumentation/vertx/vertx-web/vertx-web-4.0/src/test/groovy/server/VertxHttpServerForkedTest.groovy

@@ -94,8 +94,13 @@ class VertxHttpServerForkedTest extends HttpServerTest<Vertx> {
     true
   }
 
-  // fileUploads() returns a HashSet in Vert.x: override to verify count instead of which specific file is last
-  def 'test instrumentation gateway file upload content max files limit'() {
+  @Override
+  boolean testBodyFilesContentOrdering() {
+    false
+  }
+
+  // fileUploads() returns a HashSet in Vert.x: check count instead of which specific file is excluded
+  def 'test instrumentation gateway file upload content max files limit count'() {
     setup:
     assumeTrue(testBodyFilesContent())
     def maxFilesToInspect = Config.get().getAppSecMaxFileContentCount()

dd-java-agent/instrumentation/vertx/vertx-web/vertx-web-5.0/src/test/groovy/server/VertxHttpServerForkedTest.groovy

@@ -98,8 +98,13 @@ class VertxHttpServerForkedTest extends HttpServerTest<Vertx> {
     true
   }
 
-  // fileUploads() returns a HashSet in Vert.x: override to verify count instead of which specific file is last
-  def 'test instrumentation gateway file upload content max files limit'() {
+  @Override
+  boolean testBodyFilesContentOrdering() {
+    false
+  }
+
+  // fileUploads() returns a HashSet in Vert.x: check count instead of which specific file is excluded
+  def 'test instrumentation gateway file upload content max files limit count'() {
     setup:
     assumeTrue(testBodyFilesContent())
     def maxFilesToInspect = Config.get().getAppSecMaxFileContentCount()