Replace % string formatting with f-string

[dolfinus]

Summary

Update string % subst usage with f-string. For logging use logger.method(string, subst) instead of explicit message formatting.

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[baseplate-admin]

I did a comment on a issue, i don't think this is prioritized at this moment :

[dolfinus]

That comment just asks "why not f-string", and then closed without any discussion or describing a reason why not.

[baseplate-admin]

then closed without any discussion

The thing is i didn't close the comment.

describing a reason why not.

Precisely why i dont think that this formatting issue is not high priority