Add retries to rattler-build upload

[pavelzw]

quetz-client has the options for retries because quetz is sometimes flaky and returns 504s. It would be nice if rattler-build could do something similar.

[wolfv]

Good idea!

[pavelzw]

ideally with exponential backoff with random factor. when uploading to quetz concurrently a lot of times at once, it can happen that quetz crashes

[wolfv]

Oh no!

We can just install the same reqwest_middleware RetryMiddleware and IMO it should take care of everything.

[pavelzw]

Another issue but this is quetz related:

upload retries in quetz are broken anyways because its not unlikely that you get 502 on the first attempt, but it still goes through, and then you get 409 on your second attempt

[pavelzw]

Also, the current behavior is that when the first package upload fails, the rest will not be tried. This is bad when the first is a 409 for some reason. Then it's not possible to upload all the packages from CI through retries of the CI.