perf: Add ref.CopyNonGround #11618

Job	Run time
Go Lint	1m 44s
Generate Code	1m 7s
Rego PR checks	1m 34s
YAML Lint	20s
Go Test (linux)	4m 53s
Go Test (darwin)	5m 21s
Check Generated	28s
Go Race Detector	7m 8s
Go Build (linux amd64)	2m 40s
WASM	8s
Go Build (linux arm64)	2m 14s
Go compat build/test (ubuntu-22.04, 1.21)	3m 50s
Go compat build/test (macos-14, 1.21)	4m 54s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 6s
Go Build (windows amd64)	2m 31s
Go Build (darwin amd64)	1m 37s
Go Build (darwin arm64)	1m 1s
docker image smoke test	30s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	11s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	11s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	25s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	13s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	1m 3s
	46m 9s

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