According to the Google docs here: https://support.google.com/a/answer/10445916
> The rate of Drive API write requests is limited—avoid exceeding 3
> requests per second of sustained write or insert requests, per
> account. Note: This rate limit can’t be increased
This adds a rate limiter set to 3 per second for uploads. This is in
the hope that we can reduce the value of the main drive pacer to speed
everything else up.
Fixes#7384
45c6cf5891