Clean scope code resolver when starting environment emulation

[unicoder88]

Summary

Hi! We came upon a problem with custom uploaded image placeholders in different store views - their configuration is not visible for stores other than first.

Steps to reproduce:

1. Add a product without an image
2. Go to Stores > Configuration > Catalog > Catalog
3. Switch scope to non-default store view (e.g. second in the list)
4. Upload custom images in Product Image Placeholders section
5. Reindex Algolia, e.g. single product by SKU - Stores > Algolia > Reindex SKU

Expected: custom image placeholder in Algolia search for this product.
Actual: default image placeholder.

After debug, problem is in ScopeCodeResolver.

1. Algolia iterates stores: 1 (default store)
2. ScopeCodeResolver resolves and caches current store to store 1.
3. Algolia iterates stores: 2 (non-default store with custom placeholder)
4. ScopeCodeResolver resolves cached current store to store 1 - here's an error. It fails to pick up that we are emulating store 2 this time.
5. Placeholder asset reads configuration using incorrectly resolved store ID, always returning placeholder for first store in the list.

Please have a look :)

[damcou]

Thanks for your PR @unicoder88 !
I checked and indeed, there was an issue with placeholders set on store view.
Seems to be fixed with your changes.