Uninstaller: Add Silent command-line switch to allow an existing installation of NVDA to be removed without any manual intervention

[elliott94]

Is your feature request related to a problem? Please describe.

NVDA offers several command-line switches that can be used to specify certain parts of its configuration. Whilst we currently allow NVDA to be silently installed, the same isn't true for uninstallation - which manually needs to be performed. To automate the process - both in environments that may contain hundreds/thousands of NVDA installations or where automation is required, it'd be useful to add a command-line switch to the uninstaller to do this.

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Additional context

[feerrenrut]

Ideas on #11622 will affect this one.

[feerrenrut]

See also #12322