fix: clean the installed extensions and inspector cache on intentional CLI uninstall

[DimitarTachev]

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• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
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• Tests for the changes are included.

What is the current behavior?

The NativeScript CLI extensions and Inspector cache are not removed even when the CLI is uninstalled by the user.

What is the new behavior?

These resources are removed along with the CLI.

Related to #4255