Converge on inconsistent network issue behaviours on Web and Android

### Steps to reproduce

1. Send message while the network is dropping out
-> Message is unsent and a warning appears
2. Re-establish network

On Web:
3. Get asked if messages should be deleted or re-sent:

On Android:
3. No error appears against the message, it's not possible to delete the message and messages are automatically re-sent when network is re-established

### Development checklist
- [ ] Tagged as T-Enhancement and with correct A-* label
- [ ] Product team confirmed that this feature:
- [ ] …is on the roadmap or
- [ ] …could be added to the roadmap or developed by a community member
- [ ] Design team has signed off on the feature: design has been finalised by the Element design team and attached to this issue:
- [ ] Acceptance criteria (in scope) have been clearly defined:
- [ ] Product and Design have agreed on how this should be handled
- [ ] Acceptance criteria are updated based on ^
- [ ] Clearly defined issues are filed for relevant changes
- [ ] Behaviour is verified against iOS app
- [ ] Out of scope:
- [ ] Redesigning a new behaviour beyond convergence