Add a real asset to IonSnapService dev sandcastle

[markschlosseratbentley]

Feature

See this comment: #13682 (comment)

Now that #13682 has merged, we should try to add a real asset to the ion-snapping-dev Sandcastle before next release.

Depending on the state of #13699, also consider updating the asset in the hybrid snapping dev Sandcastle as well.

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