[stable10] allow admins to enable medial search on group and user

[karakayasemi]

Backport of #34659

Description

allow admin to enable medial search on group and user

Related Issue

Fixes #33883 and https://github.com/owncloud/enterprise/issues/2311

Motivation and Context

we have accounts.enable_medial_search but we should move to one option respected globally for users, and one for groups, making the results more consistent.

How Has This Been Tested?

• Create a group with "test" gid,
• add 'groups.enable_medial_search' => true line to config
• Sharing search dialog should list "test" group when you write "es"
• change config as 'groups.enable_medial_search' => false
• Sharing search dialog should not list "test" group when you write "es"

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 #34779 into stable10 will increase coverage by <.01%.
The diff coverage is 91.66%.

@@              Coverage Diff               @@
##             stable10   #34779      +/-   ##
==============================================
+ Coverage        64.2%    64.2%   +<.01%     
- Complexity      19883    19885       +2     
==============================================
  Files            1278     1278              
  Lines           76246    76256      +10     
  Branches         1291     1291              
==============================================
+ Hits            48950    48959       +9     
- Misses          26917    26918       +1     
  Partials          379      379

Flag	Coverage Δ	Complexity Δ
#javascript	53.22% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.36% <91.66%> (ø)	19885 <1> (+2)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Group/Database.php	97.72% <91.66%> (-0.64%)	26 <1> (+2)

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