support multiple possible file names

[sshane]

working version of #542

generically allows any list of file names per type by making multiple upload requests

• the failed request comes back and temporarily shows "not found" on the button
  • we can potentially wait for both/all to come back.
  • or add new urls param to the athena upload endpoint, but that requires more changes to request file types instead of file names

We'll take the first naive approach to get this shipped ASAP, then properly fix once we drop file extensions altogether (hopefully soon after).

We instead use one doUpload call with multiple file paths and check the failed list that returns. If not all file paths for a segment fail, no fail.

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[sshane]

You can switch back and forth between athenad versions and it all just works:

Any cached uploads will fail though, which is expected as at that point you're requesting a zst/bz2 file to be uploaded to its counterpart url which isn't what we want