feat(@angular-devkit/build-angular): switch to use Sass modern API

[alan-agius4]

Sass modern API provides faster compilations times when used in an async manner.

Application compilation duration	Sass API and Compiler
60852ms	dart-sass legacy sync API
52666ms	dart-sass modern API

Note: https://github.com/johannesjo/super-productivity was used for benchmarking.

Prior art: http://docs/document/d/1CvEceWMpBoEBd8SfvksGMdVHxaZMH93b0EGS3XbR3_Q?resourcekey=0-vFm-xMspT65FZLIyX7xWFQ

BREAKING CHANGE:

Deprecated support for tilde import has been removed. Please update the imports by removing the ~.

Before

https://github.com/import "~font-awesome/scss/font-awesome";

After

https://github.com/import "font-awesome/scss/font-awesome";

[alan-agius4]

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