Older CLI projects don't match the tsconfig layout of newer projects

[StephenFluin]

🐞 Bug report

Command (mark with an x)

- [x] update

Is this a regression?

No

Description

Older projects (such as https://github.com/GDGTC/devfest/commits/master/src/tsconfig.json) have a single tsconfig file. This was never migrated by our tooling to tsconfig.app.json which means that some of our assumptions about these files are incorrect. This breaks things such as the schematics in 8 to take advantage of differential loading.

We should consider detecting these configs and migrating them.

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