Alan Agius 562dc6a892 fix(@angular-devkit/build-angular): prefer ES2015 entrypoints when application targets ES2019 or lower
Previously, we always consumed the ES2020 entrypoints, which caused issues in environments where the application compilation target is ES2019 or lower and ES2020 is not supported.

This is because we only downlevel code when we target ES5 or below.

- ES5 or below compilations, ES2015 entrypoints are used and their code is downlevelled to ES5.
- ES2019 or below, ES2015 entrypoints are used and no downlevelling is involved.
- ES2020 or later, ES2020 entrypoints are used.

Closes #22270
2021-12-08 08:33:31 +01:00
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