GUI is unhelpful in case of file name too long

### ⚠️ Before submitting, please verify the following: ⚠️

- [X] This is a **bug**, not a question or a configuration issue.
- [X] This issue is **not** already reported on Github (I've searched it).
- [X] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

Sometimes, file names on the server are too long to sync to an ext4 filesystem. The client reports it, but in a fashion that is unhelpful :

- the main dialog will show the beginning of the offending file name,
- the parameters dialog show an error message on a red background, with the end of the offending file name,
- neither give a way to copy the file name.

Also, the ``.nextcloudsync.log`` does not contain a message pertaining to this.

### Steps to reproduce

1. Have a very long file name on the server and a client syncing to an ext4 filesystem.
2. Observe.

### Expected behavior

There should be a way to copy the offending file name (trough a contextual menu, a button, or a link).

### Which files are affected by this bug

the point of this bug report is that it is cumbersome to get that information

### Operating system

Linux

### Which version of the operating system you are running.

KUbuntu 22.04

### Package

Other

### Nextcloud Server version

n/a

### Nextcloud Desktop Client version

3.13.0

### Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.4.2 to 3.4.4)

### Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

### Are you using an external user-backend?

- [ ] Default internal user-backend
- [ ] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

_No response_

### Additional info

_No response_