[12.2.x] fix(@angular-devkit/build-angular): improve fidelity and performance of babel loader sourcemaps #21900
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This change uses the
@ampproject/remapping
package to merge sourcemaps generated from the customized babel loader used to perform the partial compilation linking in applications as well as other optimization and downleveling transformations. This provides more accurate output mappings as well as improved performance and lower memory usage when source maps are enabled within a build.12.2.x variant of #21857