Run samples tests in CI

[BrunnerLivio]

Feature Request

Is your feature request related to a problem? Please describe.

Currently samples are being built in CI, but not tested. To further strengthen the tests of NestJS we should automatically test sample test against the built NestJS code.

Describe the solution you'd like

The CI should check for each sample whether npm run test and npm run test:e2e is defined. If one of these commands is available, it should run these tests with the built NestJS code.

Track how long the CI task will run for. Currently Build all samples takes around 10 minutes. Since this issue will further extend this task, we may should investigate in paralleling the build (one build & test task per sample) or try other approaches (investigate more into caching).

Related issue #3173 #1539

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