chore: remove unused highlight group

[smnatale]

Description

Remove unused highlight groups

Screenshots/Images

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b15c5f57-2567-4628-86f4-90e62c3ffadb

📥 Commits

Reviewing files that changed from the base of the PR and between f0ff9be and 64e20ee.

📒 Files selected for processing (1)

• lua/coderabbit/init.lua

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