Switch RecreateSKPs and Bookmaker bots to use service accounts

Bug: skia:
Change-Id: I59aefe7c7e7a6861b00f0e22310e7ceaff3d6d0e
Reviewed-on: https://skia-review.googlesource.com/122944
Reviewed-by: Ravi Mistry <rmistry@google.com>
12 files changed