[AI Bundle] Add tests for processors

[OskarStark]

Q	A
Bug fix?	no
New feature?	no
Docs?	no
Issues	Follows #428
License	MIT

cc @VincentLanglet

[Copilot]

Pull Request Overview

This PR fixes a bug where processor tags were using incomplete agent IDs instead of the full agent service IDs. The issue was that tags were using the variable $agentId (which contained just the agent name) instead of the properly prefixed 'ai.agent.'.$name format.

• Replaces $agentId variable usage with hardcoded 'ai.agent.'.$name string concatenation in processor tag assignments
• Adds comprehensive test coverage to verify processor tags use the correct full agent IDs
• Ensures all processor types (tool, structured output, token usage, system prompt) properly reference their associated agents

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
src/ai-bundle/src/AiBundle.php	Fixes processor tag agent IDs to use full 'ai.agent.'.$name format instead of incomplete $agentId variable
src/ai-bundle/tests/DependencyInjection/ProcessorConfigurationTest.php	Adds comprehensive test coverage for processor tag configuration validation

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