loader: Avoid reading UNC paths by default #10609

Job	Run time
Generate Code	1m 9s
Go Lint	1m 33s
YAML Lint	15s
Rego PR checks	1m 31s
Check Generated	25s
Go compat build/test (ubuntu-22.04, 1.21)	3m 16s
Go Test (linux)	5m 1s
Go Build (linux amd64)	2m 38s
Go compat build/test (macos-14, 1.21)	3m 44s
Go Test (darwin)	4m 11s
Go Build (linux arm64)	2m 4s
Go Race Detector	5m 58s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 9s
WASM	10s
Go Build (windows amd64)	2m 25s
Go Build (darwin amd64)	2m 3s
Go Build (darwin arm64)	49s
docker image smoke test	25s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	12s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	11s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	26s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	18s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	28s
	41m 21s

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