Remove the Better Normalizers module from Varbase Core 10.0.x branch

Problem/Motivation

No further needs to use

• A file normalizer that base64 encodes data, taken from file_entity.
• A menu link content normalizer which embeds dependencies on target entity, by UUID, when applicable.

Varbase Default Content and demo and testing content modules had been switched from base64 data to physical file under the new Default Content YAML format. and dropped the use of JSON in Varbase Default Content modules

Proposed resolution

Remove the Better Normalizers module from Varbase Core 10.0.x branch
Not to be enabled when exporting default content ( No longer needed )

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-10.0.0-alpha1, varbase_core-10.0.0-alpha1

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 #3331814: Removed the Better Normalizers module from Varbase Core 10.0.x branch