Added GCS uploads to additional outputs

[robsv]

Added Google Cloud Storage uploads for outputs from the following sources:
inputs/annotations.py
inputs/dvidseg.py
inputs/sizes.py
outputs/neurotransmitters.py
outputs/reports.py
This does not include HTML or PNG files (yet).

Test uploads are viewable at https://console.cloud.google.com/storage/browser/flyem-snapshots/2023-09-26-932d3f

cc @stuarteberg

[stuarteberg]

This changeset involves edits to many files and adds the same config setting in several parts of the config. Also, this highlights the fact that feather files are being exported during supposedly "input" steps.

This all reveals a problem with the way my original code was factored. I think we need to fix up the original logic first. Perhaps all of the exports (feather files and GCS upload) should probably occur during the 'flat connectome' export step. (I would exclude certain feather files which are meant more as debugging outputs. I would also exclude the feather files that are part of the 'reports' step.)

Side note: Before we embark on any refactoring of the code, I have changes in my local development branch I should merge...