[#2640994] fix(views): Consolidate all entity reference arguments into a single plugin, fix label token replacement

• Consolidate all entity reference arguments into a single EntityArgument plugin.
• BC provided for all the legacy ways these plugins could be instantiated or accessed
• Remove a bunch of (nearly) duplicate code
• Improve consistency and functionality while reducing technical debt
• Add an EntityReferenceArgument (entity_target_id) plugin that correctly handles title token replacement
• Provide post_update() method to set all entity reference arguments from numeric to entity_target_id

Suggested commit message:

[#2640994] fix(views): Consolidate all entity reference arguments into a single plugin, fix label token replacement

Authored-by: dww <git@dwwright.net>
Authored-by: tduong
Authored-by: Alex Bukach
Authored-by: Berdir
Authored-by: ameymudras
Authored-by: catch
Authored-by: Mohit Aghera <mohit.beta@gmail.com>