agent: add Java to Kotlin conversion skill

[alperozturk96]

🖼️ Screenshots

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/30005818006/artifacts/8563074675
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]

APK file: https://github.com/nextcloud/android/actions/runs/30008206031/artifacts/8564091799
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]

APK file: https://github.com/nextcloud/android/actions/runs/30009261079/artifacts/8564504891
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	32	32
Correctness	66	66
Dodgy code	208	208
Experimental	1	1
Malicious code vulnerability	2	2
Multithreaded correctness	25	25
Performance	41	41
Security	19	19
Total	394	394

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/30010354366/artifacts/8564981385
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]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.

[github-actions]

master-IT test failed: https://www.kaminsky.me/nc-dev/android-integrationTests/17369-IT-master-15-52