feat: [chat] Chat Apps can now retrieve the import mode expire time i…

…nformation to know when to complete the import mode properly (#5860)

* feat: Chat Apps can now retrieve the import mode expire time information to know when to complete the import mode properly
docs: Update reference documentation to include import_mode_expire_time field

PiperOrigin-RevId: 702468699

Source-Link: googleapis/googleapis@608531f

Source-Link: googleapis/googleapis-gen@59d7d94
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNoYXQvLk93bEJvdC55YW1sIiwiaCI6IjU5ZDdkOTQ2MjA4MGNlMDFkMWUzNjQyYzFjNTcxYTM1Y2ZjZTM3OTYifQ==

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

packages/google-chat/protos/google/chat/v1/space.proto

@@ -338,6 +338,16 @@ message Space {
     PermissionSettings permission_settings = 27
         [(google.api.field_behavior) = OPTIONAL];
   }
+
+  // Output only. The time when the space will be automatically deleted by the
+  // system if it remains in import mode.
+  //
+  // Each space created in import mode must exit this mode before this expire
+  // time using `spaces.completeImport`.
+  //
+  // This field is only populated for spaces that were created with import mode.
+  google.protobuf.Timestamp import_mode_expire_time = 28
+      [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
 // A request to create a named space with no members.