Fix remaining test files for required field changes

Update MessagesTest, IntegrationTest, and CompaniesTest to remove
.orElseThrow() calls that are no longer needed since the SDK now
returns non-optional types.

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

Author: mailsongabriel

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

@@ -42,11 +42,7 @@ public void before() {
                 client.contacts().list(ListContactsRequest.builder().perPage(1).build());
 
         // act
-        contactId = randomContacts
-                .getItems()
-                .get(0)
-                .getId()
-                .orElseThrow(() -> new RuntimeException("Contact ID is required"));
+        contactId = randomContacts.getItems().get(0).getId();
         company = client.companies()
                 .createOrUpdate(java.util.Optional.of(CreateOrUpdateCompanyRequest.builder()
                         .name(Utils.randomString())

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

@@ -61,13 +61,13 @@ public void before() {
                 .create(CreateContactRequest.of(CreateContactRequest.WithExternalId.builder()
                         .externalId(Utils.randomString())
                         .build()));
-        userId = user.getId().orElseThrow(() -> new RuntimeException("User ID is required"));
+        userId = user.getId();
         lead = client.contacts()
                 .create(CreateContactRequest.of(CreateContactRequest.WithRole.builder()
                         .role("lead")
                         .name("Marek Barek")
                         .build()));
-        leadId = lead.getId().orElseThrow(() -> new RuntimeException("Lead ID is required"));
+        leadId = lead.getId();
         tag = client.tags()
                 .create(TagsCreateRequestBody.of(CreateOrUpdateTagRequest.builder()
                         .name(Utils.randomString())
@@ -126,8 +126,7 @@ public void testTagConversation() {
         // act
         Tag response = client.tags()
                 .tagConversation(TagConversationRequest.builder()
-                        .conversationId(message.getConversationId()
-                                .orElseThrow(() -> new RuntimeException("Conversation ID is required")))
+                        .conversationId(message.getConversationId())
                         .tagId(tag.getId())
                         .adminId(adminId)
                         .build());

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

@@ -42,7 +42,7 @@ public void before() {
                         .externalId(Utils.randomString())
                         .name("Message Test User")
                         .build()));
-        userId = user.getId().orElseThrow(() -> new RuntimeException("User ID is required"));
+        userId = user.getId();
     }
 
     @AfterEach