* 3.4: (33 commits)
Remove remaining `@experimental` annotations
Tests and fix for issue in array model data in EntityType field with multiple=true
[Validator] Add unique entity violation cause
[Lock] Automaticaly release lock when user forget it
[Form] Fixed PercentToLocalizedStringTransformer to accept both comma and dot as decimal separator, if possible
fixed CS
[FrameworkBundle] Don't clear app pools on cache:clear
Hide label button when its setted to false
removed useless PHPDoc
[HttpFoundation] Return instance in StreamedResponse
[Form] Fix FormInterface::submit() annotation
[PHPUnitBridge] don't remove when set to empty string
PdoSessionHandler: fix advisory lock for pgsql when session.sid_bits_per_character > 4
HttpCache does not consider ESI resources in HEAD requests
Fix translation for "This field was not expected"
[Routing] Enhance Route(Collection) docblocks
Added improvement for accuracy in MoneyToLocalizedStringTransformer.
Removed unused private property
Use correct verb form in the pull request template
Use PHP_MAXPATHLEN in Filesystem.
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