fix(@angular-devkit/build-angular): hide loader paths in webpack warnings

[alan-agius4]

Similar to errors messages we now hide webpack paths in warnings to reduce clutter.

Before

./src/styles.scss.webpack[javascript/auto]!=!./node_modules/css-loader/dist/cjs.js??ruleSet[1].rules[6].rules[0].oneOf[0].use[1]!./node_modules/postcss-loader/dist/cjs.js??ruleSet[1].rules[6].rules[0].oneOf[0].use[2]!./node_modules/resolve-url-loader/index.js??ruleSet[1].rules[6].rules[1].use[0]!./node_modules/sass-loader/dist/cjs.js??ruleSet[1].rules[6].rules[1].use[1]!./src/styles.scss?ngGlobalStyle - Warning: Module Warning (from ./node_modules/sass-loader/dist/cjs.js):
Deprecation $weight: Passing a number without unit % (60) is deprecated.

To preserve current behavior: $weight * 1%

More info: https://sass-lang.com/d/function-units

@material/slider/_slider-theme.scss 77:5                                    @use
node_modules/@angular/material/slider/_slider-theme.scss 3:1                @use
node_modules/@angular/material/core/density/private/_all-density.scss 25:1  @forward
@angular/_index.scss 18:1                                                   @use
src/styles.scss 2:1                                                         root stylesheet

After

./src/styles.scss - Warning: Module Warning (from ./node_modules/sass-loader/dist/cjs.js):
Deprecation $weight: Passing a number without unit % (60) is deprecated.

To preserve current behavior: $weight * 1%

More info: https://sass-lang.com/d/function-units

@material/slider/_slider-theme.scss 77:5                                    @use
node_modules/@angular/material/slider/_slider-theme.scss 3:1                @use
node_modules/@angular/material/core/density/private/_all-density.scss 25:1  @forward
@angular/_index.scss 18:1                                                   @use
src/styles.scss 2:1                                                         root stylesheet

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