Code style changes from downstream

[MorrisJobke]

• downstreams Sanitize length headers when validating quota owncloud/core#26366
• it only contains namespacing and code style changes to streamline upstream code base with our code base
• backport of this is not needed

cc @rullzer@nickvergessen@icewind1991

[mention-bot]

@MorrisJobke, thanks for your PR! By analyzing the history of the files in this pull request, we identified @DeepDiver1975, @PVince81 and @nickvergessen to be potential reviewers.

[MorrisJobke]

Our fix for this issue is in:

11: #1740
10: #1798
9: #1799

[nickvergessen]

Fine by me, but as said. No backport

[MorrisJobke]

Fine by me, but as said. No backport

Is this a +1 then? 😉

[LukasReschke]

LGTM

[MorrisJobke]

I tested this and it works 👍