Do not automatically truncate text fields

[cedric-anne]

Checklist before requesting a review

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.
• I have added tests that prove my fix is effective or that my feature works.

Description

Follows #19786.

When a value is truncated by CommonDBTM::filterValues(), the triggerred warning will, most of the time, not be seen by the user. The truncated part of the value may be important, for instance for an e-mail, and it is probably preferable to get a clear error rather than an invisible warning.
Also, some values may be truncated even if the database field is not limited to 255 chars.

I propose to remove this truncation, in order to trigger a SQL error when the value does not fit into the database field. The input value length should be either limited in the form, or checked by the prepareInputFor* methods.

glpi.CRITICAL:   *** Uncaught PHP Exception RuntimeException: "MySQL query error: Data too long for column 'email' at row 1 (1406) in SQL query "INSERT INTO `glpi_useremails` (`email`, `users_id`, `is_default`) VALUES ('this-is-a-very-long-email-address-that-should-trigger-a-sql-error-if-it-is-not-truncated-on-the-php-side-but-it-should-not-be-worse-that-the-current-truncation-logic-that-triggers-a-warning-that will-not-be-visible-for-most-of-the-users-that-will-think--that-everything-is-ok@example.com', '5', '1')"." at DBmysql.php line 369
  Backtrace :
  ./src/DBmysql.php:369                              
  ./src/DBmysql.php:1311                             DBmysql->doQuery()
  ./src/CommonDBTM.php:772                           DBmysql->insert()
  ./src/CommonDBTM.php:1388                          CommonDBTM->addToDB()
  ./src/User.php:1779                                CommonDBTM->add()
  ./src/User.php:1337                                User->updateUserEmails()
  ./src/CommonDBTM.php:1822                          User->post_updateItem()
  ./front/user.form.php:142                          CommonDBTM->update()
  ...Glpi/Controller/LegacyFileLoadController.php:59 require()
  ./vendor/symfony/http-kernel/HttpKernel.php:181    Glpi\Controller\LegacyFileLoadController->__invoke()
  ./vendor/symfony/http-kernel/HttpKernel.php:76     Symfony\Component\HttpKernel\HttpKernel->handleRaw()
  ./vendor/symfony/http-kernel/Kernel.php:197        Symfony\Component\HttpKernel\HttpKernel->handle()
  ./public/index.php:56                              Symfony\Component\HttpKernel\Kernel->handle()