Enable Generic.NamingConventions.TraitNameSuffix

Problem/Motivation

Follow up to #3521443: Traits should always have the suffix "Trait"

The sniff is in Coder 9.

Steps to reproduce

$ git grep '^trait' | grep -v "Trait {"
core/lib/Drupal/Core/Menu/MenuLinkFieldDefinitions.php:trait MenuLinkFieldDefinitions {
core/modules/dblog/tests/src/Functional/FakeLogEntries.php:trait FakeLogEntries {
core/modules/link/tests/src/Traits/LinkInputValuesTraits.php:trait LinkInputValuesTraits {
core/modules/workspaces/tests/src/Functional/WorkspaceTestUtilities.php:trait WorkspaceTestUtilities {

Proposed resolution

Deprecate traits that need to be renamed

Remaining tasks

Postponed on updating to Coder 9.

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet