fix: update wallet heights when processing blocks

[xdustinface]

We currently don't update the wallet heights when processing blocks. This PR fixes it and adds a test to ensure the updates happen.

Based on:

• feat: track synced_height per ManagedWalletInfo #305

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/update-height

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[github-actions]

This PR has merge conflicts with the base branch. Please rebase or merge the base branch into your branch to resolve them.