feat(@angular-devkit/build-angular): collect test coverage from JSX/TSX files

[AdamVig]

When testing React with Karma in a monorepo managed with Nx (built on top of the Angular CLI), I
found that TSX files were not showing up in test coverage reports. This change seems to fix that issue.

[AdamVig]

@mgechev If you have the time, would you mind explaining what about this pull request needs to be discussed?

I am under the impression that TSX is supported by the project based on this comment by filipesilva (from 2017, but I could not find anything more recent).

I need this change for a work project, so I am trying to determine if I should wait for it to get merged or if I should find a workaround.

[mgechev]

Hey @AdamVig, since Angular does not use JSX supporting it extends our scope of work. During our triage meeting this/next Thursday we'll discuss how to proceed.

[mgechev]

Since we already have partial tsx support we can merge this fix and discuss separately whether we want to keep maintaining the feature.

Thanks for the contribution!

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