fix(@angular-devkit/build-angular): experimental esbuild pipeline, add es2015
to main fields for RxJS v6 compatibility
#25406
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Currently, for RxJS v6, no conditions are available, and the ESBuild pipeline will select the
ES5 distribution based on the
module
main field. This is fine in most cases, but applicationscould benefit from better optimization with the use of the ES2015 output + there are certain
code differences that currently would cause runtime breakages when e.g.
rxjs/testing
is used.See: #25405 for more details.
Fixes #25405.