feat: rewrite go-runner to use overlay files #385

Job	Run time
go-runner-benchmarks	6m 22s
lint	1m 8s
tests (1.25.x)	3m 16s
compat-integration-test-walltime (example)	1m 38s
tests (1.24.x)	3m 31s
compat-integration-test-walltime (example/timing)	1m 37s
compat-integration-test-walltime (example/external)	1m 35s
compat-integration-test-walltime (example/compat)	1m 32s
compat-integration-test-walltime (example/very/nested/module)	1m 34s
check	3s
	22m 16s

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