frontend: update lint checks to correctly utilize EnvList and EnvSetter #5061

Job	Run time
build (windows/amd64)	1m 35s
build (freebsd/amd64)	1m 35s
test-windows-amd64 (containerd, ./client)	4m 5s
test-freebsd-amd64	3m 13s
test-windows-amd64 (containerd, ./cmd/buildctl)	2m 59s
test-windows-amd64 (containerd, ./worker/containerd)	1m 37s
test-windows-amd64 (containerd, ./solver)	2m 15s
test-windows-amd64 (containerd, ./frontend)	1m 48s
test-windows-amd64 (containerd, ./frontend/dockerfile)	28m 17s
test-windows-amd64 (./..., 1)	12m 26s
	59m 50s

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