#5609 Add UI modal hint when auto including a public key

[martgil]

This PR improves UX when the auto include public keys happens by showing a UI modal informing that a public key has been automatically included.

close #5609

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Tests (delete all except exactly one):

• Tests added or updated

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• [ ] addresses the issue it closes (if any)
• [ ] code is readable and understandable
• [ ] is accompanied with tests, or tests are not needed
• [ ] is free of vulnerabilities
• [ ] is documented clearly and usefully, or doesn't need documentation

[martgil]

@sosnovsky Ready for review. Thank you!

[martgil]

I'll fix the appearing failing tests first.