dev-tooling: Only restart Go services that actually changed

Created by: mrnugget

Before this change we would restart all the Go commands that we recompiled.

And we touched a file outside a ./cmd/ subfolder that would mean that we recompile all Go commands and restart all of them.

Example: when you touched ./enterprise/internal/campaigns/types.go which is only used by frontend and repo-updater, we would compile and restart

• repo-updater
• frontend
• gitserver
• symbols
• query-runner
• github-proxy
• searcher
• replacer

With the change here, we use diff to check whether the binary actually changed and only restart the ones that did change.

For the same example that means we would still recompile all of them but only restart:

• repo-updater
• frontend

And: symbols, because symbols somehow always changes its binary. I suspect this has to do with CGO?

Anyhow: this should be a good improvement for dev workflows.

Happy about any feedback on my Bash code :)