chore: fix test compilation and precision issues for CI

[ritik4ever]

Summary

This PR adds missing regression tests and addresses test coverage gaps across the backend keeper modules to ensure robustness under edge cases.

Changes Included

• Compound Scheduler: Added catch-up behavior tests to ensure missed intervals after downtime are handled deterministically without duplicate execution.
• Vault Monitor: Introduced capacity forecasting tests covering rising utilization, sudden inflows, and saturation/safety warnings.
• Keeper Queues: Added test coverage for poison-message isolation and retry caps to verify that bad jobs stop retrying and healthy jobs continue independently.
• Redis State: Added Redis reconnect and TTL expiry regression tests to validate transient disconnections and prevent stale keeper state revival.

Issue Links

Closes #811
Closes #812
Closes #813
Closes #814

Verification

• Local build completes successfully.
• Added tests verify required behavior.
• All CI/CD pipelines and required checks are expected to pass.

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[edehvictor]

Nice contribution!