Better unit testing reporting and pipeline caching

• better unit test and coverage reporting integration with Azure DevOps
• updated jest-junit dependency
• added dependencies caching
• switched to ubuntu agent for better performance

Upgraded References

• sass-loader: 8.0.0
• handlebars: 4.5.3
• ts-loader: 6.2.1
• vue-loader: 15.7.2
• vie-property-decorator: 8.3.0
• fork-ts-checker-webpack-plugin: 3.0.1