Workflow - use insecure curl when can

[nyurik]

Turned out that some update jobs failed due to

{
  "message": "Bad credentials",
  "documentation_url": "https://developer.github.com/v3"
}

This is probably due to credentials expiring (long workflow startup?),
or some internal github issue.

For now, removing authenticated curl calls because most
of them can be done anonymously, and keeping them only when needed.

[nyurik]

Hopefully last iterative workflow patch -- these for some reason do not reproduce elsewhere, so had to do them on OMT repo. Now should have fewer github action run errors.