Feature/554 auto generate markets and marketlist upon mcdev init + fixes #590 bug around git user names/emails

[JoernBerkefeld]

PR details

What is the purpose of this pull request?

• Add something to the core
• closes [FEATURE] auto-generate markets and marketList upon mcdev init #554
• fixes [BUG] multiple git user names / emails provided as default #590

What changes did you make? (Give an overview)

when mcdev init is executed it now auto-populates markets and marketList in the config with actual values based on the retrieved list of BUs. We ask the user which BU is the development BU to properly fill deployment-source vs deployment-target lists. Also, we exclude ParentBU in these market lists.

Is there anything you'd like reviewers to focus on?

1. I decided to auto-fill created markets with ONE variable already, suffix, and so far, the value we fill is "underscore + buName". That's a placeholder.
2. Alternatively, we could have no market variables in the markets or an empty suffix parameter, or we could even ask the user for a list of parameters (comma separated) to refill each market with that list of (empty) parameters.
3. In a CI/CD environment with skipInteraction enabled, one can pass in the name via --y.developmentBu=myBuName or leave it empty, which shows a warning and pushes all BUs (except parent) into the target list.
4. If mcdev init is re-run, e.g. to add a 2nd credential, this code is NOT executed. It really only runs upon the initial execution

Checklist

• I have performed a self-review of my own code
• ran npm run test to with 0 tests failing
• I have commented my code, particularly in hard-to-understand areas
• ESLint & Prettier are not outputting errors or warnings