Add instagram handler validator

update entreprise model to match the correct pattern for instagram attribute & add migration to correct wrong links in db + test

db/migrate/20221208150521_update_enterprise_instagram_links.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class UpdateEnterpriseInstagramLinks < ActiveRecord::Migration[6.1]
+  class Enterprise < ActiveRecord::Base
+    def strip_url(url)
+      url&.sub(%r{(https?://)?}, '')
+    end
+
+    def correct_instagram_url(url)
+      url && strip_url(url.downcase).sub(%r{www.instagram.com/}, '').sub(%r{instagram.com/},
+                                                                         '').delete("@")
+    end
+
+    def instagram
+      correct_instagram_url self[:instagram]
+    end
+  end
+
+  def up
+    Enterprise.where.not(instagram: nil).find_each do |enterprise|
+      enterprise.update!(instagram: enterprise.instagram)
+      enterprise.save!
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end