[Core] remove country-aware currency context as it messes with the Storage Based Currency Context

[dpfaffenbauer]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no

[solverat]

to reproduce:

• allow two currencies: one store "test" with base currency EUR and an additional currency CHF
• go to GeoLiteBasedRequestResolver
• add on top of method findCountry: return $this->countryRepository->findByCode("CH");
• go to frontend for store "test": CHF is selected

=> incorrect - should be EUR until changes currency by triggering the switch-currency route.
=> it is also NOT possible to switch the currency because the forced selected currency gets overruled by CountryAwareCurrencyContext.