Add win_arm64_compile to CQ and add win_arm64_msvc_compile as optional

For now, win_arm64_msvc_compile is off by default on CQ and not on CI.
Once I've confirmed it works, I'll add it to CI and enable it in CQ.

Bug: 573
Change-Id: Ic954686592f3aa981e45cd993ee0c7ba767a72a3
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/57925
Reviewed-by: Bob Beck <bbe@google.com>