Add fast pusher for fast builds (#2114)
* Add fast pusher for fast builds
* Separates push into standard and fast
* Generates the necessary tar files to push
* Calls the backend to create a file to push
* Add Login Token to HTTP POST request
* Remove redundant tar files
* When building/pushing make sure we remove
redundant tar files we have created previously.
* Add tests to fast push
* Fix injecting docker command into push
* Add LoadLoginToken to docker command object
* Add a create src tarfile error
* Mock CreateTarFile
* Format generate apt tarball errors
* Inject the docker command object
* Allow mocking of docker exec commands
* Use command to create apt tar file
* Fix bad variable assignment
* Remove aptTarPath assignment
* Add a comment on the use of image on CreateTarFile
* Change the config arg to a packages array arg
* Use snakeCase for apt tarball prefix/suffix consts
* Use snakeCase in fast push consts
* Use error groups to wait for multiple uploads
* Remove ineffectual assignment
* Do not use url as a variable name
* Remove size from the backend call
* Set test environment with t.Setenv
* Put MockCommand in dockertest package
* Fix pip_freeze integration test
