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Draft: Use `initializer` to configure all database connections

Kamil Trzciński (Back 2025-01-01) requested to merge reconfigure-database-yml into master

What does this MR do and why?

Currently we selectively re-configure database connections to ensure that proper pool sizes or prepared statements are in place.

This was order dependent, and required a numerous re-establish connections. This moves the configuration aspect early after Rails initializes database ensuring that all required settings are holistically applied to all configs.

This is PoC how this can look and this makes it open for feedback.

Related to: #333411 (closed).

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Kamil Trzciński (Back 2025-01-01)

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