[infra] Remove failing skpbench jobs

These have been failing for 9+ months

Change-Id: I9cc15298ee0ea1f2f1070affeeb5392ced376793
Bug: skia:12268
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/514276
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
2 files changed