Add option to refresh non-harvest local repo

[alfinkel]

Overview

We should add an option to permit harvest to refresh a local repo that it did not itself standup.

Requirements

• When providing a --repo-path we need to add an option to permit the collator to refresh that environment. Current behavior is to only let harvest refresh a repo that it pulled down originally.
• As part of this enhancement we should also change logic to allow harvest to pull down a repo locally to the repo path provided if no repo existed in that location. Thereby allowing for harvest to write local repos to a non-$TMPDIR location.

Approach

TBD

Security and Privacy

TBD

Test Plan

TBD