chore: remove kdbx

[jeeanribeiro]

Summary

Removes KDBX and all its related content (seedvault, locales, etc.) because they are not used

Changelog

- Removes KDBX lib and its related code
- Removes seed vault code
- Removes seed vault locales

Relevant Issues

closes #4887

Testing

Platforms

• Desktop
  • MacOS
  • Linux
  • Windows
• Mobile
  • iOS
  • Android

Checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or modified tests that prove my changes work as intended
• I have verified that new and existing unit tests pass locally with my changes
• I have verified that my latest changes pass CI workflows for testing and linting
• I have made corresponding changes to the documentation

[Tuditi]

LGTM! 🔥