fix: override pre-generated database connection

[Ian2012]

Description

It was supposed that the connection string from ClickHouse and MySQL were fixed by this PR: https://github.com/openedx/tutor-contrib-aspects/pull/581. However, the asset generated with a random user/password were used instead. This PR makes sure that the SQL alchemy string is correct.

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[bmtcril]

What is the best way to test this? Is there any concern about bootstrapping a new instance with these changes?

[Ian2012]

No, there isn't any concern on new instances. Already installed instances should be repaired.

You can test on a fresh local installation, and verify the connection string is using your current credentials instead of the ones on the CI of this repository

[bmtcril]

I've never run into the bug locally, though, is this only showing up in k8s?

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