Enable ECA Metatag integration module by default in Varbase SEO

Problem/Motivation

#3537397: Add ECA: Event - Condition - Action and BPMN.iO modules to Varbase Core
#3543084: Enable more ECA: Event - Condition - Action integration modules by default in Varbase Core

Proposed resolution

Add drupal/eca_metatag ~2 in the composer.json file.
Enable in the default Varbase SEO recipe

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ✅ Developer Documentation support on feature change/addition
  

  Added ECA Metatag to Varbase SEO doc page

• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release varbase-10.1.0-beta1, varbase_seo-10.1.0-beta1

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Issue #3544187: Enabled ECA Metatag integration module by default in Varbase SEO
  

  Added ECA Metatag to Varbase SEO doc page