BugFix - Check Filename Limitation With Correct Server Version and Configuration

[alperozturk96]

• Tests written, or not not needed

What does this PR?

• Allow folder creation/renaming with trailing spaces or periods if no WCF config is present.
• Enforce WCF rules (e.g., forbidden file extensions, reserved file names) when WCF configs exist.
• Improve feedback messages: remove "." from translations and use OCCapability to display forbidden file extensions, eliminating string manipulation.
• Uses lowercase for comparison in any case
• Updates tests according to correct NC versions

Acceptance Criteria

• For NC versions below 30, no checks are performed.
• For versions 30 and above with WCF, OC capability checks are applied.
• File emptiness and duplicate filename checks are always enforced, regardless of version or limitations.

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	59	59
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	63	63
Correctness	64	64
Dodgy code	299	299
Experimental	1	1
Internationalization	7	7
Multithreaded correctness	6	6
Performance	53	53
Security	18	18
Total	511	511

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/13552.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[alperozturk96]

/backport to stable-3.30