gammaray: switch to qt layout

[GunniBusch]

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Planned commits

• gammaray: switch to qt layout

Validation summary

• gammaray: style: pass, test: pass, audit: pass

This should technically fix #276948

I switched from the .app to qt layout. I tested if everything worked, by debugging some random qt app.
Also I added actual testing.

[GunniBusch]

  gammaray
    * Stable: The source URL https://github.com/KDAB/GammaRay/releases/download/v3.4.0/gammaray-3.4.0.tar.gz is not reachable (HTTP status code 502)
  Error: 1 problem in 1 formula detected.

Github😩

[github-actions]

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