feat: Support valid models in custom components

[fsbraun]

Summary by Sourcery

New Features:

• Add valid_models attribute to CMSFrontendComponent to configure allowed models for custom components.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Introduces a new “valid_models” option in the base component form to allow custom components to declare which Django model types they support.

Class diagram for updated CMSFrontendComponent with valid_models option

classDiagram
    class CMSFrontendComponent {
        link_fieldset_position
        require_parent
        parent_classes
        valid_models
    }

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File-Level Changes

Change	Details	Files
Expose a valid_models field on the base component form	Added “valid_models” to the CMSFrontendComponent’s list of declared form fields	djangocms_frontend/component_base.py

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.00%. Comparing base (a7a748d) to head (b376470).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #323   +/-   ##
=======================================
  Coverage   89.00%   89.00%           
=======================================
  Files         124      124           
  Lines        3383     3383           
  Branches      287      287           
=======================================
  Hits         3011     3011           
  Misses        256      256           
  Partials      116      116           

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