Remove the Better Login module from Varbase Core 10.0.x branch in favor of Gin Login module

Problem/Motivation

• #3325970: Add Gin Toolbar and Gin Login modules to Varbase Admin and disable Admin Toolbar Extra Tools, and Links Access Filter in Varbase 10.0.x
• #3326075: Drop support for the Better Login module in Vartheme BS5 2.0.x

Proposed resolution

• Remove the Better Login module in Varbase Core 10.0.x branch

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 #3326720: Removed the Better Login module from Varbase Core 10.0.x branch in favor of Gin Login module