feat: rewrite go-runner to use overlay files #393

Job	Run time
go-runner-benchmarks	6m 23s
tests (1.24.x)	1m 39s
compat-integration-test-walltime (example/compat)	2m 46s
compat-integration-test-walltime (example/very/nested/module)	2m 18s
compat-integration-test-walltime (example/timing)	7m 39s
compat-integration-test-walltime (example/external)	3m 0s
compat-integration-test-walltime (example)	1h 9m 6s
lint	1m 14s
tests (1.25.x)	1m 59s
check	4s
	1h 36m 8s

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