Fix pr-merge.yaml to include PR title and link in Discord notifications

[Copilot]

The PR merge notification workflow was only sending basic information to Discord, making it difficult for users to understand what was merged without manually looking up the PR.

Before:

Pull Request 123 merged by testuser

After:

Pull Request #123 "Fix LED brightness issue" merged by testuser
https://github.com/wled/WLED/pull/123

The solution uses environment variables and jq for safe JSON escaping to handle edge cases like PR titles containing quotes, special characters, or newlines. This approach is consistent with existing workflow patterns in the repository and prevents potential JSON injection issues.

Changes:

• Added PR title in quotes to the notification message
• Added clickable PR URL on a new line
• Used jq -n --arg for proper JSON escaping
• Added # prefix to PR number for better readability

Fixes #4879.

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