Apply Layout/LineLength rubocop rule

Note we're excluding a few files:

* Configuration files that weren't generated by us
* Migration files that weren't generated by us
* The Gemfile, since it includes an important comment that must be on
  the same line as the gem declaration
* The Budget::Stats class, since the heading statistics are a mess and
  having shorter lines would require a lot of refactoring

app/models/verification/management/email.rb

@@ -53,10 +53,12 @@ class Verification::Management::Email
       return if errors.count > 0
 
       if document_number_mismatch?
-        errors.add(:email,
-                   I18n.t("management.email_verifications.document_mismatch",
-                          document_type: ApplicationController.helpers.humanize_document_type(user.document_type),
-                          document_number: user.document_number))
+        errors.add(
+          :email,
+          I18n.t("management.email_verifications.document_mismatch",
+                 document_type: ApplicationController.helpers.humanize_document_type(user.document_type),
+                 document_number: user.document_number)
+        )
       end
     end
 

app/models/verification/residence.rb

@@ -48,7 +48,9 @@ class Verification::Residence
   end
 
   def document_number_uniqueness
-    errors.add(:document_number, I18n.t("errors.messages.taken")) if User.active.where(document_number: document_number).any?
+    if User.active.where(document_number: document_number).any?
+      errors.add(:document_number, I18n.t("errors.messages.taken"))
+    end
   end
 
   def store_failed_attempt
@@ -74,7 +76,8 @@ class Verification::Residence
   end
 
   def local_postal_code
-    errors.add(:postal_code, I18n.t("verification.residence.new.error_not_allowed_postal_code")) unless valid_postal_code?
+    errors.add(:postal_code,
+               I18n.t("verification.residence.new.error_not_allowed_postal_code")) unless valid_postal_code?
   end
 
   def local_residence