Inconsistent formatting of values for `pac env list-settings` and `pac env update-settings`

The --json flag could perhaps provide additional fields for the actual values, but as mentioned in #1058 there seems to be an issue with this where it only returns "ValueKind": "3".

I tried falling back to parsing the non json text output, but it's clear that from pac env list-settings are formatted, while pac env update-settings take unformatted values. e.g.:

% pac env list-settings --environment *** -f fullname                                                             
Connected as ******
Setting                Value
fullnameconventioncode First Name

The input takes a int value such as 0, 1, 2, ... 7 representing a choice:

% pac env update-settings --environment *** --name fullnameconventioncode --value 3                                   
Connected as ******
Setting 'fullnameconventioncode' updated successfully to '3'.

https://learn.microsoft.com/en-us/power-apps/developer/data-platform/reference/entities/organization#fullnameconventioncode-choicesoptions

Start by tracing the pac env list-settings and pac env update-settings command entry points in the Power Platform VS Code extension. Compare how fullnameconventioncode is formatted and parsed, including the --json output and the linked choice-options reference. Done means the two commands represent choice values consistently and the relevant output is usable without manual conversion.