Trust & Decoration | Show specific decryption error for messages sent by a user in Verification Violation

[BillCarsonFr]

part of https://github.com/element-hq/crypto-internal/issues/308

When OnlySignedDeviceIsolationMode is enabled, messages sent from insecure devices will fail to decrypt.

Currently these messages will be displayed as regular UTD:

We need to show a specific decryption error now. Notice that in a future task we will decrypt the message anyhow and show a warning as per this design

Need a design for the temporary solution where it's in UTD

We have design for push: