Switch Varbase Layout Builder to use Entity Definition Update Manager class from vardot/entity-definition-update-manager class library

Problem/Motivation

Support for automatic entity updates has been removed
https://www.drupal.org/node/3034742

#3232568: Switch Varbase Entity Definition Update Manager class to extend the vardot/entity-definition-update-manager class library

Steps to reproduce

Given that on the install of Varbase Layout Builder module
When it needs to update entity definitions on install or updates
Then the old namespace was not right and the arguments had changed for Drupal 9

Proposed resolution

Switch to EntityDefinitionUpdateManager class from Vardot/entity-definition-update-manager

Remaining tasks

• ✅ File an issue about this project
• ✅ Switch to EntityDefinitionUpdateManager class
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ✅ Developer Documentation support on feature change/addition
  

  Entity Definition Update Manager Class

• ➖ User Guide Documentation support on feature change/addition
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Release varbase-9.0.2, varbase_layout_builder-10.0.5

User interface changes

• None

API changes

• None

Data model changes

• None