[skfe] Remove references to gold stage instances
[skfe] Remove references to gold stage instances

Bug: skia:
Change-Id: I17d945e76d6fe9e503083f5c68e10deb2b696675
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/203040
Reviewed-by: Stephan Altmueller <43343ec95731c0e8daa7359daf7f2f3935582b24@google.com>
Commit-Queue: Stephan Altmueller <43343ec95731c0e8daa7359daf7f2f3935582b24@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot