[Tests-Only] Fix phpstan.neon after phpstan 0.12.33 release

[phil-davis]

Description

CI is failing, e.g. https://drone.owncloud.com/owncloud/core/25992/4/7

php -d zend.enable_gc=0 vendor-bin/phpstan/vendor/bin/phpstan analyse --memory-limit=2G --configuration=./phpstan.neon --level=0 apps core settings lib/private lib/public ocs ocs-provider
 -- --------------------------------------------------------------------------- 
     Error                                                                      
 -- --------------------------------------------------------------------------- 
     Ignored error #Unsafe usage of new static().# has an unescaped '()' which  
     leads to ignoring all errors. Use '\(\)' instead.                          
 -- --------------------------------------------------------------------------- 

 [ERROR] Found 1 error                 

phpstan https://github.com/phpstan/phpstan/releases/tag/0.12.33 now reports what is actually a problem in phpstan.neon

Fix it and also remove items from excludes_analyse that can now be analysed by phpstan.

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