test: Parallelize package tests in high-cost packages. #11101

Job	Run time
Go Lint	1m 37s
Rego PR checks	1m 28s
Generate Code	1m 8s
YAML Lint	18s
Check Generated	24s
WASM	13s
Go Test (linux)	3m 56s
Go Build (linux amd64)	2m 21s
Go Test (darwin)	3m 29s
Go Build (linux arm64)	2m 1s
Go compat build/test (ubuntu-22.04, 1.21)	3m 59s
Go Race Detector	6m 1s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 13s
Go compat build/test (macos-14, 1.21)	4m 25s
Go Build (windows amd64)	2m 32s
Go Build (darwin amd64)	2m 51s
Go Build (darwin arm64)	56s
docker image smoke test	38s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	10s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	11s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	23s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	16s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	40s
	42m 10s

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