[graphite] Generate new mipmaps when copying mipmapped texture

Bug: b/238754357
Bug: b/292712763
Change-Id: I867429d57654551bb7596415c297bdff592c2587
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/734304
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: James Godfrey-Kittle <jamesgk@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
16 files changed