[Tests-Only] Php 7.4 another pack of fixes

[VicDeo]

Related Issue

owncloud/enterprise#3967

Motivation and Context

This is critical for unit tests to pass with PHP 7.4

How Has This Been Tested?

By CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[codecov]

Codecov Report

Merging #37293 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master   #37293   +/-   ##
=========================================
  Coverage     64.52%   64.52%           
- Complexity    19158    19161    +3     
=========================================
  Files          1266     1266           
  Lines         74925    74928    +3     
  Branches       1331     1331           
=========================================
+ Hits          48344    48347    +3     
  Misses        26189    26189           
  Partials        392      392           

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.68% <100.00%> (+<0.01%)	19161.00 <0.00> (+3.00)

Impacted Files	Coverage Δ	Complexity Δ
apps/dav/lib/Connector/Sabre/File.php	83.92% <100.00%> (+0.05%)	116.00 <0.00> (+1.00)
...aring/lib/Controllers/ExternalSharesController.php	96.07% <100.00%> (+0.16%)	17.00 <0.00> (+2.00)
lib/private/Files/Storage/Wrapper/Encryption.php	69.19% <0.00%> (-0.25%)	158.00% <0.00%> (ø%)
apps/dav/lib/CardDAV/SyncService.php	46.36% <0.00%> (+0.90%)	25.00% <0.00%> (ø%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c19ff83...e4cc9fa. Read the comment docs.