fix(@angular-devkit/build-angular): transform remapped sourcemap into a plain object #21977
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remapping
will return a SourceMap which it's prototype is not a simple object. This causes Babel to fail when it invoked fromistanbul-lib-instrument
because Babel withdon't know how to turn this value into a node
error as Babel will not process not simple objects.See: https://github.com/babel/babel/blob/780aa48d2a34dc55f556843074b6aed45e7eabeb/packages/babel-types/src/converters/valueToNode.ts#L115-L130
Closes #21967