Refactor logs

[s-leigh]

There were a few things I found confusing looking at this project for my other PR, so I thought I'd suggest some very minor refactors. I kept it separate so you can just ignore this one if you like!

• If the artifact doesn't exist at all, the server still logs out "not found locally, downloading it" which sounded (to me) like it definitely does exist remotely. I slightly reworded it to make it clear that we're only looking for it remotely.
• I removed the log line about it being successfully downloaded because it looks like that may trigger in certain situations even if the process has failed. I looked at putting it in downloadArtifact() or artifactApi.ts but it seems like Axios will error if it fails, and there is already error logging if the compression fails, so it seemed both misleading and unnecessary.
• Made the default port a const as that (or a config file) is where I'd expect to find it.
• Type hinting for downloadArtifact() that I added when putting the above logline in there before I decided against it. Left it in just for helpfulness.

[felixmosh]

Looks like a great PR :] Thank you for submitting it 👍🏽

can you rebase the master so I will be able to merge it?

[s-leigh]

Done! I remembered to run build as well. Just have a quick glance yourself to make sure I rebased properly :)

[felixmosh]

Thank you for this PR 🙏🏼