Disable Multiparts uploads

[kobergj]

Multipart uploads do cause extreme memory consumption

[mmattel]

Is there an envvar behind the change and if yes, should this/the behaviour be mentioned in the docs?

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[kobergj]

@mmattel We need to find out how to mitigate the issue before we update docs or env descriptions.

[butonic]

AFAICT we should disable s3.concurrent_stream_parts by setting it to false and not
s3.disable_multipart. defaulting it to true will cement bool defaults to true which is something admins should explicitly enable.

IMO defaulting s3.concurrent_stream_parts to true was wrong by me.

[butonic]

https://github.com/owncloud/ocis/pull/8666/files#diff-1bcbf5887e19b4fa234e42541fb15612f1391532ddc02348b738b5a6d7b6a51dR116 should be false.