src: remove unowned usages of GetBackingStore
This removes all usages of GetBackingStore without any entries in the
CODEOWNERS
file. For the most part this is a pretty straightforward
review; except SPREAD_BUFFER_ARG
and the changes to CopyArrayBuffer
.
See the linked issue for an explanation.
Refs: https://github.com/nodejs/node/issues/32226 Refs: https://github.com/nodejs/node/pull/43921