Symbolize load balancer configuration keys
What does this MR do and why?
This ensures that if database.yml uses strings as the configuration keys, we still honor the custom configuration settings; instead of using default ones.
This bug was introduced in !69233 (merged)
MR acceptance checklist
Quality
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Quality checklist confirmed
Performance, reliability, and availability
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Performance, reliability, and availability checklist confirmed
Documentation
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Documentation checklist confirmed
Security
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Security checklist confirmed
Deployment
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Deployment checklist confirmed