[Pimcore 11 / Bug] Add PimcoreSimpleBackendSearchBundle as dependency

[aarongerig]

Q	A
Bug report?	yes
Feature request?	no
BC Break report?	no
RFC?	no

CoreShop should add and install the PimcoreSimpleBackendSearchBundle in order to prevent the following error in the browser console, when loading in the Pimcore backend.

Uncaught TypeError: Cannot read properties of undefined (reading 'element') at:
coreshop.selector.object = Class.create(pimcore.bundle.search.element.selector.object, { ... });