Kdesktop 1027 add test for ticket 896

[herve-er]

Description

This PR adds tests for the Fix init value for logUploadState PR. It includes:

A unit test for the stringToAppVersion method. A prevention system to avoid setting a default appState value to an empty string accidentally, and the associated unit tests.

Related Issue

Fix init value for logUploadState

Checklist

• [x] Tests added and passing for stringToAppVersion
• [x] Prevention system to avoid setting a default appState value to an empty string accidentally.
• [x] Tests of the prevention system

[sonarcloud[bot]]

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