fix: WalletConnect, reject proposal if no supported network

[dianasavvatina]

Proposed changes

Fixed handling of session proposal request via WalletConnect if the required network list is not supported.
Now using WalletConnectError exception and sending the response properly.

Previously the response was not sent to the dapp.

Types of changes

• Bugfix
• New feature
• Refactor
• Breaking change
• UI fix

Steps to reproduce

1. go to https://dappradar.com/
2. click Connect -> WalletConnect -> copy link
3. try to connect in Umami
4. See toast on Umami:
   The requested required network "eip155:1" is not supported. Available: tezos:mainnet,tezos:ghostnet
5. See toast on dappradar
   Login with WalletConnect Failed. Please check your wallet notifications and try again.

Screenshots

Add the screenshots of how the app used to look like and how it looks now

Checklist

• Tests that prove my fix is effective or that my feature works have been added
• Documentation has been added (if appropriate)
• Screenshots are added (if any UI changes have been made)
• All TODOs have a corresponding task created (and the link is attached to it)

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