What's being changed:

• Avoid recursive locking by reading directly the multi tenancy config instead of calling MultiTenancyConfig that will re-acquire the lock.
• Had a pass run with https://github.com/sasha-s/go-deadlock to find others -> all clear

Original fix by @etiennedi, re-opened to have a fix that is more in-line with the way the code base usually fix these problems (not a new function but instead reading the needed data while holding the lock).

Review checklist

• Documentation has been updated, if necessary. Link to changed documentation:
• Chaos pipeline run or not necessary. Link to pipeline: https://github.com/weaviate/weaviate-chaos-engineering/actions/runs/9124531178
• All new code is covered by tests where it is reasonable.
• Performance tests have been run or not necessary.