Hubspot throttler optimization: 9 requests every 5 seconds max

[epipav]

Changes proposed ✍️

What

🤖 Generated by Copilot at 5e89e3e

Reduced the request rate and concurrency of the RequestThrottler for the Hubspot integration. This improves the integration performance and avoids rate limit errors.
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🤖 Generated by Copilot at 5e89e3e

RequestThrottler
Slows down Hubspot requests -
Winter of refactoring

Why

How

🤖 Generated by Copilot at 5e89e3e

• Reduce the request concurrency and interval to the Hubspot API to avoid rate limits and improve performance ([link](https://github.com/CrowdDotDev/crowd.dev/pull/1533/files?diff=unified&w=0#diff-9f1e520577b76cc5d6a43ee5a18bb292de586ed1bcaa63270bad90caf79268c6L18-R18))

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots 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.