Azure Storage Explorer won't run on Linux VM unless .NET is updated

[TonyWildish-BH]

Describe the bug

Azure Storage Explorer doesn't run on the new Ubuntu 22.04 image out of the box. It gives an error message stating that .NET SDK 8.0 is needed, but the installed version is 7.0.

This is easy to fix on the VM by uninstalling dotnet-sdk-7.0 and replacing it with dotnet-sdk-8.0, then the Storage Explorer runs correctly.

Updating templates/workspace_services/guacamole/user_resources/guacamole-azure-linuxvm/vm_config.sh, line 61, and rebuilding the template fixes this at source.

Steps to reproduce

1. Deploy the current HEAD (commit e84e625)
2. Deploy a workspace, then Guacamole, then a Linux VM.
3. Attempt to start the Azure Storage Explorer, wait for the error message

Azure TRE release version (e.g. v0.14.0 or main):
current HEAD

Deployed Azure TRE components - click the (i) in the UI:

[tim-allen-ck]

I'll raise a PR for this now @TonyWildish-BH