Revert of Retract GrRenderTarget a bit within SkGpuDevice (patchset #2 id:20001 of...

Revert of Retract GrRenderTarget a bit within SkGpuDevice (patchset #2 id:20001 of https://codereview.chromium.org/1956473002/ )

Reason for revert:
Experimental revert to track down perf regression

Original issue's description:
> Retract GrRenderTarget a bit within SkGpuDevice
>
> Split off of: https://codereview.chromium.org/1930013002/ ((Mostly) Retract GrRenderTarget from SkGpuDevice)
>
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1956473002
>
> Committed: https://skia.googlesource.com/skia/+/d215a95882485026d176a81bf58871276b21c89c

TBR=bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/1954103002