fix(@schematics/angular): update or add module and target to non extend…

[alan-agius4]

…ed tsconfig

Fixes #14436

[filipesilva]

Discussed offline whether we should migrate the old single tsconfig to the new setup. We decided it was too risky now, this close to 8 final.

But that we should try and do it for 9, both for the configs and other structural changes.

[alexeagle]

@alan-agius4 this is too risky for 8 but @StephenFluin asks, could we find the tsconfig in the old location and update the module/target setting there?

[alan-agius4]

@alexeagle thats exactly what this PR does.

Filipe is out, and we decided not to do the thing

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