Add package-specific FMF metadata to Reproducer Agent

[Koncpa]

Add package-specific FMF metadata to the Reproducer Agent

TODO:

• Add unit tests for YAML parsing, prompt rendering, and queue propagation.
• Update docstrings where appropriate.
• Update Reproducer documentation and the agents-as-skills mirror.

What this does:

Adds support for selected package-specific FMF metadata from the package rules
repository's ymir.yaml:

• require
• recommend
• environment
• duration
• tier
• tag

The workflow now:

• Reads and validates reproducer.fmf configuration.
• Passes the configuration from the reproducer queue to the agent.
• Instructs the agent to merge the values into generated or adapted main.fmf.
• Keeps the existing default behavior when no package customization exists.
• Rejects unsupported FMF configuration keys instead of silently ignoring them.
• Keeps the Reproducer Agent skill and documentation synchronized.

Fixes https://redhat.atlassian.net/browse/PACKIT-5438