fix: follow up on database certificates properties renaming

[yann-soubeyrand]

Hi,

It seems that the renaming of the database certificates properties broke the creation of the secret when certificates are provided to the charts. This PR is my attempt to fix it.

Definition of Ready

• I am happy with the code
• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• No debug or dead code
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• If possible, the test configuration is adjusted so acceptance tests cover my changes