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Show size of uploaded artifacts and caches in the build log

What does this MR do?

Causes gitlab-ci-multi-runner to output the size of the cache and artifact ZIP files that it uploads.

Are there points in the code the reviewer needs to double check?

  • Are we happy with the output format? Adding a separate line for the file size didn't look very good to my eyes.
  • Should I be smarter with the units? Intelligently display closest KiB / MiB / GiB ?
  • Merging the HTTP client code in commands/helpers/cache_archiver.go into network/gitlab.go would permit a common approach
  • A new MIT-licensed dependency is introduced. It would be trivial to embed, rather than vendor, it.
  • There are no tests for build log contents that I could find, so I didn't add any. We should definitely consider adding comprehensive tests for this at some point.

Why was this MR needed?

Sensible suggestion from user

What are the relevant issue numbers?

Closes #1320

Screenshots (if relevant)

Creating cache build/master...
./cache: found 1 matching files                    
Uploading size=4278 bytes                
# [...]
Uploading artifacts...
./artifact: found 1 matching files                 
Uploading artifacts to coordinator... ok            id=616 responseStatus=201 Created size=4529 bytes token=Sasexv-d
Build succeeded

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