Move more Ops to skgpu::v1 namespace (take 2)

GrClearOp
GrDashOp

Bug: skia:11837
Change-Id: I9ada76c061154e769e7f486e7c57a93fd1d74907
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/444636
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
11 files changed