Update "Get started with human task orchestration" guide with Play

[mesellings]

This work was moved out of #4144 as it was a blocker.

(Delay until the 8.6 release. That should coincide with the re-release of Play where it becomes part of the core onboarding experience).

Overview

We will need to update the Getting Started docs to include the work done for the development lifecycle, as per:

• Review comments on PR OOTB PDLC Happy Path documentation #4144 (comment)
• Slack https://camunda.slack.com/archives/C074KNLFU6T/p1724315804098819?thread_ts=1724148415.055099&cid=C074KNLFU6T.

Acceptance criteria

• Getting started guides
  Include Play, milestone creation, and review as steps before running it on the cluster.

[akeller]

Is the expectation to release with the alpha? If so, please add the alpha5 label.

[mesellings]

@HanselIdes FYI: I'm going to try and make these doc changes next week so it's in the 8.6 release, but might need some guidance as to exactly how the Getting Started journey should be changed.

[mesellings]

Created working branch: mes-4183-update-getting-started-with-dev-lifecycle

[HanselIdes]

@mesellings can you set up a 30m session when it works for you to discuss this? I have some content I can walk you through about the new user journey, starting with this Miro doc