Use named arguments for FunctionCall constraints

Problem/Motivation

Drupal 11.3 requires Symfony 7.4.

In Symfony 7.4, passing an array to constraint constructors is deprecated; we must use named arguments instead. See #[3522497].

Steps to reproduce

Ask the chatbot, or the agent explorer, to create a content type or a vocabulary. You get an error like "Unknown named parameter $value".

Proposed resolution

Use named arguments on constraint definitions in FunctionCall.

From:

constraints: ['Regex' => '/^[a-zA-Z0-9_]+$/'],

to:

constraints: ['Regex' => ['pattern' => '/^[a-zA-Z0-9_]+$/']],

Remaining tasks

Review the MR.

User interface changes

None.

API changes

None.

Data model changes

None.