chore: #3272242 Expose audit trail report as a View -- By: capysara, scottatdrake, yazanmajadba

Add Views integration for audit trail report

Expose admin_audit_trail table to Views following Drupal Core's dblog
pattern. This allows the report at /admin/reports/audit-trail to be
provided by a configurable View instead of the custom form.

New components:
- hook_views_data() implementation exposing all table fields
- Custom filter plugins for Type and Operation dropdowns
- Custom field plugin for safe HTML description rendering
- Views wizard plugin for "Add new view" UI
- Views schema configuration
- Default View in config/optional/ (auto-installs when Views is enabled)

The legacy form-based report is moved to /admin/reports/audit-trail/legacy
with a deprecation notice. The legacy menu link is hidden; users can access
it via the link in the new View's header.

Closes #3272242

Remaining tasks

• File an issue
• Addition/Change/Update/Fix
• Testing to ensure no regression
• Automated unit testing coverage
• Automated functional testing coverage
• UX/UI designer responsibilities
• Readability
• Accessibility
• Performance
• Security
• Documentation
• Code review by maintainers
• Full testing and approval
• Credit contributors
• Review with the product owner
• Release Notes
• Release