Remove repositories, minimum-stability, prefer-stable from composer.json file for Varbase Demo

Problem/Motivation

• Moving to default use of Composer ~2 and later.
• Having repositories in the in the composer.josn

Proposed resolution

• Remove "repositories", "minimum-stability": "dev",, and "prefer-stable": true,. from the composer.josn file.
• Move libraries to Varbase Libraries

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
• ➖ 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-10.0.6, varbase_demo-1.0.7, varbase-10.1.0-alpha2, varbase_demo-1.1.0-alpha3

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 #3532997: Removed repositories, minimum-stability, prefer-stable from composer.json file for Varbase Demo