Refactor kubernetes training service

[chicm-ms]

kubernetes training service code needs to be refactored to fix following eslint error:

  24:36  error  'TFOperatorClientV1Alpha2' was used before it was defined       @typescript-eslint/no-use-before-define
  27:36  error  'TFOperatorClientV1Beta1' was used before it was defined        @typescript-eslint/no-use-before-define
  30:36  error  'TFOperatorClientV1Beta2' was used before it was defined        @typescript-eslint/no-use-before-define
  39:36  error  'PyTorchOperatorClientV1Alpha2' was used before it was defined  @typescript-eslint/no-use-before-define
  42:36  error  'PyTorchOperatorClientV1Beta1' was used before it was defined   @typescript-eslint/no-use-before-define
  45:36  error  'PyTorchOperatorClientV1Beta2' was used before it was defined   @typescript-eslint/no-use-before-define```