[Mate][Symfony] Add AI and MCP profiler formatters

[wachterjohannes]

Q	A
Bug fix?	no
New feature?	yes
Docs?	yes
Issues	None
License	MIT

Summary

This adds Symfony bridge formatter support for the repo-owned ai and mcp profiler collectors.

The bridge now returns normalized collector payloads instead of falling back to raw dumped data when these collectors are present.

Changes

• add AiCollectorFormatter for the symfony/ai-bundle profiler collector
• add McpCollectorFormatter for the symfony/mcp-bundle profiler collector
• add shared raw collector payload extraction logic for array-based collectors
• register both formatters in the Symfony Mate bridge profiler formatter registry
• add formatter tests for both collectors
• add the Symfony bridge changelog entry under 0.8

Testing

• php -l on the changed Symfony bridge PHP files
• PHPUnit could not be run in this workspace because vendor/bin/phpunit is not installed here
• PHP CS Fixer could not be run successfully because the installed fixer/config combination errors on the void_return rule customisation