* build: fix release CI jobs start script

This broke in #30492, we weren't handled 20X status codes and weren't authing to appveyor correctly.

* build: do not pass undefined to Auth header in CI scripts

(cherry picked from commit a48968c1)

* build: use basic auth to trigger CI if either a username OR password is provided

(cherry picked from commit d1bd9afb)

* build: manually pull 64bit dugite for 32bit tests (#30531)

(cherry picked from commit 8b9d0092

)

Co-authored-by: Samuel Attard <samuel.r.attard@gmail.com>
Co-authored-by: Samuel Attard <sam@electronjs.org>