[Swagger/Docs] - Remove all traces of build

[ehotinger]

Example in EncodedTaskRunRequest:

 :param timeout: Build timeout in seconds. Default value: 3600 .
:type timeout: int
:param platform: The platform properties against which the build will
     happen.
:type platform:
     ~azure.mgmt.containerregistry.v2018_09_01.models.PlatformProperties
:param agent_configuration: The machine configuration of the build agent.
:type agent_configuration:

[ehotinger]

@mnltejaswini super low priority, basically just ignore this, but we should do a doc cleanup at some point.