test: Parallelize package tests in high-cost packages. #11112

Job	Run time
YAML Lint	19s
Go Lint	1m 34s
Rego PR checks	1m 27s
Generate Code	1m 4s
Check Generated	25s
Go Test (linux)	4m 21s
Go compat build/test (ubuntu-22.04, 1.21)	1m 58s
Go Build (linux amd64)	2m 23s
Go Test (darwin)	3m 30s
Go Race Detector	5m 37s
Go compat build/test (macos-14, 1.21)	2m 9s
Go Build (linux arm64)	2m 9s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 4s
WASM	9s
Go Build (windows amd64)	2m 58s
Go Build (darwin amd64)	1m 13s
Go Build (darwin arm64)	43s
docker image smoke test	26s
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)	9s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	22s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	22s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	37s
	36m 10s

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