Feature: #97392 - Use password policy for new admin users created in ext:install

See forge#97392

Description

The password for a new administrative backend user created using the install extension does now consider the configurable password policy introduced in #97388.

Impact

The globally configured password policy is now taken into account when a new administrative backend user is created using the install extension. Password policy requirements are shown below the password field and a message is shown, if the new password does not meet the password policy requirements.