Add Search Paramater Re-Insertion to Child Tile URLs in RealityDataSourceTilesetUrlImpl

[andremig-bentley]

This PR adds _searchParams to the RealityDataSourceTilesetUrlImpl class in RealityDataSourceTilesetUrlImpl.ts. This paramater is an empty string until setBaseUrl is called, at which point, it will be set to the search parameters of the associated url if they exist. The search parameters will then be reinserted into the tile url in getTileUrl.

This is a necessary step when attaching reality data using a url from blob storage, an example being attaching a Cesium export of an iModel from the Mesh Export Service. Without these changes, using attachRealityModel() with the url provided by the MES would not work. Requests for child tiles would be unauthorized because the url would not include the search parameters/sas token from the original tileset url.

We did not think any sort of toggle or flag was necessary and that this behavior could be applied to all urls because we believe that any instance of a url containing search parameters would be an instance that needed those parameters passed on, and in all other instances, _searchParams would remain as an empty string.

@eringram @markschlosseratbentley

[eringram]

Looks good to me but I'd recommend waiting to merge for another approval too.

Also a note on what the 3D Tiles spec says about this, I found this discussion in the past where apparently query parameters shouldn't be inherited by child tiles according to the specification: CesiumGS/3d-tiles#746. However, in practice, they are inherited when CesiumJS reads 3D Tiles tilesets, and also Google Photorealistic Tiles uses some query params on the root tile similar to the MES

[andremig-bentley]

@aruniverse @markschlosseratbentley @ben-polinsky Can this PR be backported? It's currently blocking integration of the Repositories API into iTwin viewers, and as of discussions with @danieliborra, it's incredibly important to get it through as quickly as possible.

[aruniverse]

@Mergifyio backport release/4.10.x release/4.11.x

[mergify]

backport release/4.10.x release/4.11.x

✅ Backports have been created

• #7364 Add Search Paramater Re-Insertion to Child Tile URLs in RealityDataSourceTilesetUrlImpl (backport #7352) [release/4.10.x] has been created for branch release/4.10.x
• #7365 Add Search Paramater Re-Insertion to Child Tile URLs in RealityDataSourceTilesetUrlImpl (backport #7352) [release/4.11.x] has been created for branch release/4.11.x