Fix integration tests for non-Optional fields

Update tests to handle fields that are now non-Optional after adding
required field arrays to the OpenAPI schema overrides:

- TeamsTest: team.getId() now returns String directly
- SegmentsTest: segment.getId() now returns String directly
- ConversationsTest: conversationPart.getId() now returns String directly

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mailsongabriel

src/test/java/com/intercom/api/integration/ConversationsTest.java

@@ -318,8 +318,7 @@ public void testRedactConversationPart() {
                                 .conversationPartId(conversation
                                         .getConversationParts()
                                         .flatMap(parts -> parts.getConversationParts())
-                                        .map(list -> list.get(2))
-                                        .flatMap(part -> part.getId())
+                                        .map(list -> list.get(2).getId())
                                         .orElse(""))
                                 .build()));
 

src/test/java/com/intercom/api/integration/SegmentsTest.java

@@ -24,7 +24,7 @@ public void before() {
                 .getSegments()
                 .orElseThrow(() -> new RuntimeException("Segments list is required"))
                 .get(0);
-        segmentId = segment.getId().orElseThrow(() -> new RuntimeException("Segment ID is required"));
+        segmentId = segment.getId();
     }
 
     @Test

src/test/java/com/intercom/api/integration/TeamsTest.java

@@ -23,8 +23,7 @@ public void before() {
                 .getTeams()
                 .orElseThrow(() -> new RuntimeException("Teams list is required"))
                 .get(0)
-                .getId()
-                .orElseThrow(() -> new RuntimeException("Team ID is required"));
+                .getId();
     }
 
     @Test