disable part files for object stores

[icewind1991]

Renaming the part file to the target file while preserving fileids can't be done for object stores without issues.

To test

• upload a new file to s3 object store
• check the fileid
• overwrite the file with dav upload
• check the fileid again

[rullzer]

This needs more work.

If I checkout this branch we directly create a new version on upload.

[codecov]

Codecov Report

Merging #8715 into master will decrease coverage by 0.07%.
The diff coverage is 0%.

@@ Coverage Diff @@## master #8715 +/- ##
===========================================
- Coverage 51.87% 51.8% -0.08% - Complexity 25367 25368 +1 
===========================================
Files 1607 1607 Lines 95154 95156 +2 Branches 1379 1379 ===========================================
- Hits 49362 49294 -68 - Misses 45792 45862 +70

Impacted Files	Coverage Δ	Complexity Δ
...b/private/Files/ObjectStore/ObjectStoreStorage.php	66.66% <0%> (-0.57%)	75 <1> (+1)
lib/private/Files/ObjectStore/Swift.php	0% <0%> (-75%)	8% <0%> (ø)
lib/private/Files/ObjectStore/SwiftFactory.php	0% <0%> (-56.33%)	35% <0%> (ø)
lib/private/Files/Cache/Propagator.php	94.93% <0%> (-1.27%)	16% <0%> (ø)

[icewind1991]

@rullzer fixed

(this probably also was an issue when using s2s sharing)

[rullzer]

Seems to do the trick!