Remove screenshot test action

[hannesa2]

close #17145
as the gradle task simply not exists

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/27060148730/artifacts/7453758834
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	33	33
Correctness	67	67
Dodgy code	215	215
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	2	2
Multithreaded correctness	31	31
Performance	41	41
Security	16	16
Total	413	413

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/27061434237/artifacts/7454150959
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

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