feat: rewrite go-runner to use overlay files #378

Job	Run time
lint	1m 28s
tests (1.24.x)	2m 2s
compat-integration-test-walltime (example/external)	8m 43s
compat-integration-test-walltime (example/compat)	3m 59s
compat-integration-test-walltime (example/timing)	3m 53s
tests (1.25.x)	3m 32s
compat-integration-test-walltime (example/very/nested/module)	3m 53s
compat-integration-test-walltime (example)	3m 53s
go-runner-benchmarks	11m 40s
check	3s
	43m 6s

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