[12] set s3 part size to 500mb

[icewind1991]

Instead of the default 5mb

Also sets the size cutoff where we start using multipart to 500mb

[codecov]

Codecov Report

Merging #6815 into stable12 will decrease coverage by <.01%.
The diff coverage is 33.33%.

@@              Coverage Diff               @@
##             stable12    #6815      +/-   ##
==============================================
- Coverage       53.76%   53.76%   -0.01%     
  Complexity      22563    22563              
==============================================
  Files            1384     1384              
  Lines           86577    86579       +2     
  Branches         1328     1328              
==============================================
+ Hits            46546    46547       +1     
- Misses          40031    40032       +1

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/ObjectStore/S3ObjectTrait.php	59.18% <33.33%> (-0.4%)	11 <0> (ø)
lib/private/Security/CertificateManager.php	91.08% <0%> (-1%)	39% <0%> (ø)
apps/files_trashbin/lib/Trashbin.php	72.28% <0%> (-0.25%)	136% <0%> (ø)
lib/private/Server.php	84.8% <0%> (+0.12%)	121% <0%> (ø)	⬇️
lib/private/Files/Cache/Propagator.php	96.2% <0%> (+1.26%)	16% <0%> (ø)	⬇️

[mateuszsocko]

where can i change the part size?
500mb is too much, we have errors connection time out...
Change that for 100mb..