Remove some private methods from Push actor
Remove some private methods from Push actor

* deleteAppFile
* getFilesToUpload
* copyUploadableFiles

[#108559196]

Signed-off-by: Abhi Hiremagalur <340281c2654cc8d0b8c1221c7a014b7e064db6a9@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli