Update headless deployment of simulation

[michalpelka]

Change summary

We have headless console mode in development and planned 2409: https://github.com/o3de/o3de/pull/18137 https://github.com/o3de/o3de/pull/18093 so I decided to retire solution utilizing xvfb.

Submission Checklist:

• [x] Descriptive active voice - Do descriptive sentences have a clear subject and action verb?
• [x] Answer the question at hand - Does the documentation answer a what, why, how, or where type of question?
• [x] Consistency - Does the content consistently follow the Style Guide?
• [x] Help the user - Does the documentation show the user something meaningful?