Make multidev cleanup configurable

[dustinleblanc]

Hey folks! Another piece of feedback from my team on the Pantheon orb usage that I thought I'd share.

The build tools branch naming conventions and multidev management techniques (deleting stale multidevs to maintain space) are great sensible defaults, but they've seen some resistance among members of our team mostly for two reasons:

1. They prefer to name multidevs after the ticket number (which is our branch name)
2. They prefer to manually cleanup multidevs instead of having this automated (this is not a universal preference, but some see benefit in being able to access old multidevs after a project has shipped and there is a question about content/etc).

We would desire to be able to configure this behavior using orb parameters in a similar manner to the terminus clone environment, ability to not always clone content, etc.

This is another area where we could provide a pull request to implement if this feature were desirable, and it would again be backwards compatible by making the current behavior the default.

thanks!

[namespacebrian]

This is another area where we could provide a pull request to implement if this feature were desirable

@dustinleblanc yes, we like it. send us PRs :)

[dustinleblanc]

I've pivoted on this bit after looking at the code, it looks like changing the multidev naming scheme will require deeper work in the internals of the build-tools-plugin as the naming patterns are hard-coded there. It is much easier to just make the cleanup op disableable so I have a branch that I am planning to PR that does just that, same backwards compatibility