[API Enhance Request] Rename UpdateContainersRequest type name

Currently, there are two types with very similar names defined in api.proto: `UpdateContainersRequest` and `UpdateContainerRequest`. Although the functional positioning of these two types is completely different, their names only differ by an's', which makes the relevant code very confusing. Similarly, there are also `UpdateContainersResponse` and `UpdateContainerResponse` has same problem.

Please consider modifying the type names of `UpdateContainersRequest` and `UpdateContainersResponse` in version 1.0 to make them more distinguishable. For example, change them to `UnsolicitedUpdateContainers{Request, Response}` or something that is shorter.