[stable10] files:scan --group and --groups options

[phil-davis]

Description

Backport last 2 commits from #31719
Backport #34753

This effectively adds files:scan --group in addition to the existing files:scan --groups option.
See explanation in #34753 (comment)

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:

[codecov]

Codecov Report

Merging #34754 into stable10 will decrease coverage by 19.01%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             stable10   #34754       +/-   ##
===============================================
- Coverage       64.04%   45.03%   -19.02%     
===============================================
  Files            1278      116     -1162     
  Lines           75838    11465    -64373     
  Branches         1291     1291               
===============================================
- Hits            48572     5163    -43409     
+ Misses          26887     5923    -20964     
  Partials          379      379

Flag	Coverage Δ	Complexity Δ
#javascript	53.22% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	30.64% <ø> (-34.56%)	0 <ø> (-19258)

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/Storage/DAV.php	59.45% <0%> (-21.64%)	0% <0%> (ø)
apps/updatenotification/templates/admin.php
lib/private/Encryption/Keys/Storage.php
lib/private/App/CodeChecker/NodeVisitor.php
lib/private/RedisFactory.php
apps/dav/lib/Avatars/AvatarNode.php
...s/dav/appinfo/Migrations/Version20170202213905.php
apps/dav/lib/Upload/ChunkLocationProvider.php
apps/files/lib/AppInfo/Application.php
apps/systemtags/list.php
... and 1153 more

---

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[codecov]

Codecov Report

Merging #34754 into stable10 will increase coverage by <.01%.
The diff coverage is 85.71%.

@@              Coverage Diff               @@
##             stable10   #34754      +/-   ##
==============================================
+ Coverage       64.04%   64.04%   +<.01%     
  Complexity      19258    19258              
==============================================
  Files            1278     1278              
  Lines           75838    75845       +7     
  Branches         1291     1291              
==============================================
+ Hits            48572    48578       +6     
- Misses          26887    26888       +1     
  Partials          379      379

Flag	Coverage Δ	Complexity Δ
#javascript	53.22% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.2% <85.71%> (ø)	19258 <0> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
apps/files/lib/Command/Scan.php	72.18% <85.71%> (+0.34%)	62 <0> (ø)	⬇️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[PVince81]

👍

[phil-davis]

Docs issue owncloud/docs#742 and docs PR owncloud/docs#743