Manage "overseas" phone numbers on French instances

[Atala]

Overseas phone numbers (at least for France) have a different international prefix than +33 (metropolitan french prefix).

• So they are flagged as invalid by the french instances.
• Also depending on the forms they may pass validation but stored with the incorrect +33 prefix (correct prefix is +262)

Slack discussion about the problem : https://coopcycle.slack.com/archives/C4UT4DGQ3/p1719237609837429?thread_ts=1718654430.059629&cid=C4UT4DGQ3

Reported by Leo tschann coursiers nantais - see here for the phone number https://coopcycle.slack.com/archives/G01JR0YF5V3/p1724312380907709

[alexsegura]

• https://www.telefute.com/blog/reconnaitre-un-numero-de-portable-provenant-des-dom.html
• https://www.soshcaraibe.fr/faq/quest-ce-que-le-format-international-des-numeros/