Attempting to run a second instance of Chocolatey GUI quitely errors and doesn't show the user anything

[gep13]

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Is Your Feature Request Related To A Problem? Please describe.

When Chocolatey GUI is already running on a machine, if you attempt to run a second instance of it, say while you are logged in as another user, the application silently fails, with no clear indication of what happened, and why Chocolatey GUI isn't running.

You can see this happening as well when trying to run chocolateyguicli when Chocolatey GUI is already running. You can see the following (i.e. nothing is being output from the command):

when you should see the following being output from Chocolatey GUI CLI:

Describe The Solution. Why is it needed?

Currently, Chocolatey GUI estabishes an exclusive lock on the configuration database that is used to store the Chocolatey GUI configuration. As a result, another instance of Chocolatey GUI can't get access to it, and can't start. This happens quietly, so it is not immediately clear what is going on.

Chocolatey GUI should notify the end-user that there is already another instance of Chocolatey GUI running, and throw an error.

Additional Context

If/when this issue is addressed, the documentation that was added in this PR on the docs repository should be updated to explain what now happens.

Related Issues

N/A

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