Revert "Extends ProductPrice plugin to handle selection products correctly"

This reverts commit 43d57f7c16bef2a669b3dfdd3dbad695032772db.
Revert "Implements selection client in catalog detail view for product variants"

This reverts commit 9d6dffadb5c6f7d29d3f70bc641ed9b05fc8c9c3.