Assert validation with string literals is always true

[ubyte]

When a constant string literal is erroneously passed to one of the ASSERT, ABORT, VERIFY or ENSURE macros, it is silently converted to 'true', resulting in the check being skipped completely.

Example

switch (version) {
  case 1: return HandleV1();
  case 2: return HandleV2();
  default: Y_ESNURE("Unsupported version"); // exception never raised
}

related: IGNIETFERRO-2168

codesearch results: https://nda.ya.ru/t/n6pl7isS7PSQuR