Squish Tests: Missing experiment setup files

As a developer I would like to verify the following behaviour using Squish:

- In the `DAE` perspective, in the `Experiment Setup` tab:
- In the `Time Channels` tab, when there are no TCB files, a message is shown pointing to the correct location to place files.
- In the `Data Acquisition` tab, when there are no wiring/detector/spectra table files, a message is shown pointing to the correct locations to place files.
- In the `Periods` tab, when there are no period files, a message is shown pointing to the correct location to place files.

#### Additional info:
TCB - `C:\Instrument\Settings\config\\configurations\tcb`
Wiring/Detector/Spectra/Period - `C:\Instrument\Settings\config\\configurations\tables`