projector: Trigger re-auth dialog on invalid credential error

Launch the reauth dialog if there's an invalid Gaia credential error
when trying to fetch OAuth token. Also invalidate the token
when receiving a http 401.

Bug: b/269502340
Change-Id: I9aa7472b3511e8d134d74787e697a0b7bdadeca9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4521901


Reviewed-by: Yilkal Abe <yilkal@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Commit-Queue: Xiqi Ruan <xiqiruan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1147431}