[infra] Manual cherrypick to remove Win7 fyi jobs

Cherrypick of https://skia-review.googlesource.com/c/skia/+/535326

Bug: 1316545
Change-Id: I0e2a43133b491c765cadd80abccc01c5e523d9a4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/535958
Commit-Queue: Ravi Mistry <rmistry@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
3 files changed