[IMP] crm_iap_lead: add a whitelisted countries mechanism for states in iap search

States for some specific countries should not be offered as filtering options
for crm.iap.lead.mining.request because they drastically reduce the amount of
IAP reveal results.

For example, in Belgium, only 11% of companies have a defined state within the
reveal service while the rest of them have no state defined at all.

Meaning specifying states for that country will yield a lot less results than
what you could expect, which is not the desired behavior.
Obviously all companies are active within a state, it's just a lack of data in
the reveal service side.

To help users create meaningful iap searches, we only keep the states filtering
for several whitelisted countries (based on their country code).

The complete list and reasons for this change can be found on the task.

Task-2471703