Remove vulnerability_representation_information feature flag

What does this MR do and why?

This MR removes the vulnerability_representation_information feature flag and deletes its configuration file.

• Updated related files and tests to reflect the removal.

• Ensured no unintended dependencies remain.

• Changelog: changed

• EE: true

Issue: Cleanup vulnerability_representation_information

References

• Original Feature Issue: Add commit link that removed vulnerability
• [Feature flag] Rollout of vulnerability_representation_information

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