Originally, the internal GCP library in `internal/upload/gcp` was
logging various information and errors. Refactor the code to move all
logging to callers of the library. As a result, some methods now return
additional information to preserve the same amount of information being
logged for GCP.
Refactor methods to have only single purpose and not do any extra work,
such as storage cleanup. Methods which create new resources now don't do
any cleanup at all. The caller is responsible to check for any errors
and perform any cleanup necessary. Necessary methods to perform cleanup
are provided.
Modify worker's job implementation and GCP CLI tool to explicitly do all
necessary cleanup, including in case of errors.
Signed-off-by: Tomas Hozza <thozza@redhat.com>
7de2011beb