Revert order of scheduler configure() & log_start()

[MetRonnie]

Closes #4982, follow-up to #4836

Fix bug where a validation error on workflow startup was not being printed before daemonization (aka detach), which made it look like nothing was wrong. Also the return code was zero instead of non-zero as it should be.

This partially reverts some of the logging re-ordering from #4836

Check List

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• No dependency changes
• Tests are included
• CHANGES.md entry included if this is a change that can affect users
• No docs needed
• If this is a bug fix, PRs raised to both master and the relevant maintenance branch.

[datamel]

I've checked this out and have tested that it solves the issue and double checked the logging is still correct, thanks @MetRonnie.

[hjoliver]

Looks good. I like patch_log_level