Update Metatag module from ^1.12 to ~1.0 ||~2.0.0

Problem/Motivation

• #3394530: Switch Metatag module from ^1.12 to ~1.0 ||~2.0.0 to have a smooth update process and keep legacy support too

Proposed resolution

• Change drupal/metatag to ~1.0 || ~2.0.0 in the composer.json

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
• ➖ User Guide Documentation support on feature change/addition
• ➖ 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-9.0.17, varbase_media-9.0.30

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 #3394558: Updated Metatag module from ^1.12 to ~1.0 ||~2.0.0