Add check that all samples were tested

[ntnn]

Description

Adds a check in integration tests that all samples were actually checked.

I'd noticed that TestText didn't actually work correctly and added this additional check. For the moment I've disabled the TestText test, we'll take care of that with the Uni* tests.

Related issues

Link any related issues here.

Tests

• [x] make lint
• [x] make test-go / make test-cgo
• [x] make integration-go / make integration-cgo