Change rate limit configuration for Discord

[garrrikkotua]

Changes proposed ✍️

What

🤖 Generated by Copilot at fb10ef5

Increased Discord rate limit constants and renamed Redis key in handleRateLimit.ts. This improves the Discord integration and prevents unnecessary errors.
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🤖 Generated by Copilot at fb10ef5

Discord rate limits
Adjusted to match the docs
Redis key renamed

Why

How

🤖 Generated by Copilot at fb10ef5

• Increase Discord rate limit constants and rename Redis key to match API documentation (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screenshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.