62a85f5e55
As of Angular Package Format v10, we no longer ship a `fesm5` and `fesm5` output in packages. We made this change to the `ng_package` rule but intentionally did not clean up related build actions. This follow-up commit cleans this up by: * No longer building fesm5 bundles, or providing esm2015 output. * No longer requesting and building a third flavor for ESM5. We can use TSC to downlevel ES2015 sources/prodmode output similarly to how it is done in `ng-packagr`. The third output flavor (ESM5) resulted in a build slow-down as we required a full recompilation of sources. Now, we only have a single compilation for prodmode output, and then downlevel it on-demand to ES5 for the UMD bundles. Here is timing for building the release packages in `angular/angular` before this change, and afterwards: * Before: 462.157s = ~7.7min * After: 339.703s = ~5.6min This signifies a time reduction by 27% when running `./scripts/build/build-packages-dist.sh`. PR Close #37623
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