Give up on cross-repo fork PR reviews

[ar9708]

I tried here, ar9708#1, and here, ar9708#2, but even when the ANTHROPIC_API_KEY is picked up, it does nothing good.

Let us give up and start making the PRs in branches on OwnTube/web-client upstream instead for a while. Ping @mykhailodanilenko FYI!

[Copilot]

Pull Request Overview

This PR removes the Claude PR review GitHub workflow that was previously configured to automatically review pull requests using Anthropic's Claude API. The removal is motivated by issues with cross-repository fork PR reviews not functioning properly despite having the API key configured.

• Removes the entire Claude review workflow file
• Eliminates automated PR review functionality
• Simplifies the repository by removing non-functional automation

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