Tiled Gallery doesn't support native lazy loading

### Impacted plugin

Jetpack

### What

Please add native lazy loading to the Tiled Gallery block

### How

The Tiled Gallery block doesn't support native lazy loading. The only way to get Tiled Galleries to lazy load is to enable Jetpack's Lazy Loading feature, but that is now discouraged with the 12.6 update:

- Lazy Images: discourage enabling of Lazy loading images as now 90% of browser support the feature natively and this version in Jetpack can conflict with the upcoming WordPress interactivity API’

Start by locating the Jetpack Tiled Gallery block implementation and the existing Jetpack Lazy Loading handling. Check how the block renders its images, then verify that native lazy-loading attributes are present without relying on the discouraged Jetpack feature.

Written by the indexing model from the issue text.