[_] Switch to mnmemonic from password

[TamaraFinogina]

Description

This PR changes keystore key derivation from password to mnemonic, because with SSO only web has password

Checklist

• Changes have been tested locally.
• Unit tests have been written or updated as necessary.
• The code adheres to the repository's coding standards.
• Relevant documentation has been added or updated.
• No new warnings or errors have been introduced.
• SonarCloud issues have been reviewed and addressed.
• QA Passed

Testing Process

unit tests

Additional Notes

Now we won't change the keystore with the password change, because the mnemonic won't be affected. I added the function for mnemonic change just in case, but I don't know if we'll use it

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
91.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud