Rename and rework "Getting Started" walkthrough to "Create an Ansible Environment"

[alisonlhart]

The existing Getting Started walkthrough was designed to serve a temporary role as the primary Ansible extension walkthrough.

Since we're now creating more granular and focused walkthrough, this walkthrough is being split into two - "Create an Ansible Environment" and "Start automating with your first Ansible playbook" (coming soon).

Details:

• Walkthrough renamed from "Getting Started with Ansible Extension" to "Create an Ansible environment"
• Removed steps for resources and settings, since these features are/will be covered elsewhere
• Added new image for "Install the Ansible environment package" step
• Add images to the .vscodeignore exceptions, where other walkthrough images are included
• Initial UI test for the walkthrough, identifying elements on the walkthrough

These changes align this walkthrough with the "Create an Ansible environment" walkthrough designed by the UX team.

Fixes: AAP-27799.

[alisonlhart]

Still need to add UI test.

[audgirka]

lgtm

[audgirka]

merging this one first as the discover ansible dev tools walkthrough PR has the same walkthroughUiTest file updated