Update AEC Sandcastle asset ID's and add AO

[r-veenstra]

Description

Update new AEC samples with:

• new asset ID's
• ambient occlusion

Issue number and link

N/A

Testing plan

1. Ensure all new asset ID's load correctly
2. Ensure AO is visible and doesn't substantially impact performance

Author checklist

• I have submitted a Contributor License Agreement
• I have added my name to CONTRIBUTORS.md
• I have updated CHANGES.md with a short summary of my change
• I have added or updated unit tests to ensure consistent code coverage
• I have updated the inline documentation, and included code examples where relevant
• I have performed a self-review of my code

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[jjhembd]

@r-veenstra and @jjspace,
The Ambient Occlusion parameters have changed after #12316. I updated the Sandcastles to reflect the change. This also changes the result--I put a few screenshots below.

No AO:

With old AO:

With new AO:

[jjspace]

Thanks @jjhembd! I think the new ao values look pretty nice. We can adjust them again in the future if we need to for any performance hits but I think these look good for now