Remove dav.enable.tech_preview

[phil-davis]

Description

Make the new trashbin API and new public links API available by default.

• remove dav.enable.tech_preview setting/logic from source code and config.sample.php
• only do the dav.enable.tech_preview logic in tests when testing against an older version (e.g. we run core tests from apps against "latest" core release = 10.3.2)
• do not bother setting dav.enable.tech_preview for litmus tests in drone
• remove now-irrelevant tests that checked behaviour when dav.enabled.tech_preview was off (we don't really care about re-engineering them so that they will still run when testing against 10.3.2)

Related doc PR owncloud/docs#2248

Related Issue

• Fixes https://github.com/owncloud/enterprise/issues/3780

How Has This Been Tested?

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 #36815 into master will increase coverage by <.01%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##             master   #36815      +/-   ##
============================================
+ Coverage     64.68%   64.69%   +<.01%     
+ Complexity    19122    19117       -5     
============================================
  Files          1269     1269              
  Lines         74779    74774       -5     
  Branches       1320     1320              
============================================
+ Hits          48373    48376       +3     
+ Misses        26018    26010       -8     
  Partials        388      388

Flag	Coverage Δ	Complexity Δ
#javascript	54.12% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.86% <88.88%> (ø)	19117 <0> (-5)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
apps/dav/lib/Capabilities.php	0% <0%> (ø)	3 <0> (-1)	⬇️
apps/dav/lib/RootCollection.php	100% <100%> (+8.1%)	1 <0> (-2)	⬇️
apps/dav/lib/Server.php	51.28% <100%> (+0.01%)	20 <0> (-2)	⬇️

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[phil-davis]

Note: I checked this locally to make sure we do not go down this path on the current core 10.4.0.1 version, and will go down this path on 10.3.*

[individual-it]

tests look good to me

[phil-davis]

@micbar the backend code changes are very simple. Artur has reviewed the test code changes.
Maybe you can review/approve/merge this? Otherwise please allocate somebody.