Move oc-backbone-webdav loading to core

[PVince81]

Description

Because other apps like files_versions need it but only worked because
it was indirectly loaded by the comments app.

Related Issue

• Fixes [10.0.9] Disabling comments breaks files_versions #32117

Motivation and Context

How Has This Been Tested?

• test that comments app still works: can post a message
• test that versions app works when comments app is disabled: panel appears

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added => not possible to test loading order
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• Backport (if applicable set "backport-request" label and remove when the backport was done)

[codecov]

Codecov Report

Merging #32184 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master   #32184      +/-   ##
============================================
+ Coverage     63.96%   63.96%   +<.01%     
  Complexity    18595    18595              
============================================
  Files          1172     1172              
  Lines         69822    69822              
  Branches       1267     1267              
============================================
+ Hits          44659    44660       +1     
+ Misses        24794    24793       -1     
  Partials        369      369

Flag	Coverage Δ	Complexity Δ
#javascript	52.81% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.23% <100%> (ø)	18595 <0> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
apps/comments/appinfo/app.php	16% <ø> (+0.61%)	0 <0> (ø)	⬇️
lib/private/legacy/template.php	52.14% <100%> (+0.29%)	40 <0> (ø)	⬇️

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[felixheidecke]

Didn't test the code but it looks good from a code perspective.

[phil-davis]

Backport stable10 #32208