chore: Import support projects as examples

[NoelStephensUnity]

Purpose of this PR (wip)

This PR will be taking some of the projects created for user support and converting them over to examples with additional documentation.

Jira ticket

NA

Changelog

• Added: IntermissionAndPreloadedScenes example.
• Added: Spawn with no observers example.

Documentation

• Could include documentation updates that references some of the examples.

Testing & QA (How your changes can be verified during release Playtest)

These examples can be used as manual tests to verify specific regions of NGO are not impacted by a package release.

Functional Testing

Manual testing :

• [ X ] Manual testing done

Automated tests:

• [ ] Covered by existing automated tests
• [ ] Covered by new automated tests

Does the change require QA team to:

• [ ] Review automated tests?
• [ ] Execute manual tests?
• [ X ] Provide feedback about the PR?

If any boxes above are checked the QA team will be automatically added as a PR reviewer.

Backports

Examples are specific to NGO v2.x.