chore: enable use of QT_NO_KEYWORDS when compiling newtcloudCore target

[mgallien]

Assisted-by: ClaudeCode:claude-sonnet-5

Resolves

#

Summary

TODO

• ...

Checklist

• Sign-off message is added to all commits.
• The commit messages are following The Conventional Commits specification.
• The commit history is clean with no merge commits.
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• Uploaded screenshots from before and after for UI changes.
• Test(s) added to branch, with before/after results included in PR description, for performance improvements where applicable.
• Documentation has been updated or is not required.
• Backports requested where applicable (critical bugfixes).
• Labels added where applicable (bug/enhancement).
• Milestone added for target version.

AI (if applicable)

• The content of this PR was partly or fully generated using AI
  • I have read the guidelines for AI-assisted contributions.
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[mgallien]

/backport to stable-34.0 please

[sonarqubecloud]

Quality Gate failed

Failed conditions
37.0% Coverage on New Code (required ≥ 80%)
1 New Code Smells (required ≤ 0)

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[github-actions]

Artifact containing the AppImage: nextcloud-appimage-pr-10657.zip

Digest: sha256:9f72e2e664689a3d837914c4b56ca3702768a1163e2b9df38632a9986618b642

To test this change/fix you can download the above artifact file, unzip it, and run it.

Please make sure to quit your existing Nextcloud app and backup your data.