ci: update to CircleCI v2 config and APIs (#22330)

* build: update release build endpoint from /jobs to /job (#21232)

(cherry picked from commit 41f1569)

* chore: workflows and pipeline state were split in the circle API (#21441)

(cherry picked from commit ec0edb7)

* ci: Update to CircleCI v2 config and APIs

This reverts commit e6807b3.

* fixup config.yml

* Add needed script

* Fixup circleci config

* Partial backport of e9114b3

Needed for v2 circleci changes.

* Manually run update-external-binaries.py

* Use new cache key

* Move update external binaries to separate step

* Fix debug builds

* Download external binaries for release

Co-authored-by: Samuel Attard <samuel.r.attard@gmail.com>
Co-authored-by: John Kleinschmidt <jkleinsc@github.com>