ROX-13456: Use moq for DBClient

[kovayur]

Description

Generate DBClient mock instead of using testify.

Checklist (Definition of Done)

• Unit and integration tests added
• Added test description under Test manual
• Evaluated and added CHANGELOG.md entry if required
• Documentation added if necessary (i.e. changes to dev setup, test execution, ...)
• CI and all relevant tests are passing
• Add the ticket number to the PR title if available, i.e. ROX-12345: ...
• Discussed security and business related topics privately. Will move any security and business related topics that arise to private communication channel.

Test manual

Unit tests

[kovayur]

Current dependencies on/for this PR:

• main
  • PR ROX-13456: Use moq for DBClient #677 👈
    • PR ROX-13456: Refactor fleet-manager client in order to generate mocks for all kinds of APIs #678
      • PR ROX-13456: Bump detect-secrets to 1.4.0 #679
        • PR ROX-13456: Fail fast if cluster configuration is incorrect #681

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This pull-request has been approved by: kovayur, vladbologa

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