fix(wallet, dashboard): use validator image when possible

[VmMad]

Description of change

Please write a summary of your changes and why you made them.

Links to any relevant issues

Fixes #4179

Type of change

• Bug fix (a non-breaking change which fixes an issue)

How the change has been tested

Made a conditional to mock a single validator imageUrl in useIotaClientQuery in the dapp-kit by checking if the method is getLatestIotaSystemState. Based on that, checked the dashboard and the wallet.

Change checklist

Tick the boxes that are relevant to your changes, and delete any items that are not.

• 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 made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

[github-actions]

This pull request has been deployed to Vercel.

Latest commit: e854fa1

✅ Preview: https://wallet-dashboard-a225fcfa1e2f852205a61a7cd1d5d93e92-hcl58kn9q.vercel.app

[github-actions]

This pull request has been deployed to Vercel.

Latest commit: 5e2827d

✅ Preview: https://wallet-dashboard-a225fcfa1e2f852205a61a7cd1d5d93e92-7qkk6qz8b.vercel.app

[cpl121]

NJ!