Onboarding new Wikipedians/Revision tag

This document describes the revision tags adding to edits by users of the GettingStarted extension, as part of the new editor onboarding process.

Rationale
We apply revision tags to these edits to fulfill several use cases, captured in the following user stories: To summarize, the revision tags provide transparency in to use of the GettingStarted features, while also provide us an analytical tool.
 * As a Wikipedian, I want to know how a new user found a particular page and why they're editing it.
 * As a Wikipedian, I want to have access to a stream of all edits made via GettingStarted suggestions, so I can check them for quality.
 * As one of the maintainers of the GettingStarted extension, I want to have an easy way to track all edits made through GettingStarted, so that I can understand the impact it's having on a wiki.

Current text
Tag: new editor getting started

New text
Tag: ...

via getting started

via Getting Started edit suggestions

made via Getting Started

found with Getting Started