feat: rewrite go-runner to use overlay files #379

Job	Run time
tests (1.25.x)	3m 11s
compat-integration-test-walltime (example/very/nested/module)	3m 47s
compat-integration-test-walltime (example/timing)	10m 18s
tests (1.24.x)	2m 53s
compat-integration-test-walltime (example)	14m 51s
compat-integration-test-walltime (example/external)	4m 25s
lint	49s
go-runner-benchmarks	6m 42s
compat-integration-test-walltime (example/compat)	4m 15s
check	5s
	51m 16s

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