Prevent duplicated Address

[jbpenrath]

Bug Report

Problematic behavior Currently, user is able to create twice the same address.

Expected behavior/code If an address already exists with the same first_name, last_name, address, city, postcode and country, the user should not be able to create a duplicated one.

Additional context/Screenshots https://gip-fun-mooc.sentry.io/issues/5568514244/?environment=production&project=6599941&query=is:unresolved+issue.priority:%5Bhigh,+medium%5D&statsPeriod=24h&stream_index=1&utc=true