`Expected failure flag` was wrongly included in list of test checks.
However, the nature of checks and this flag is different:
- any test check can pronounce the test as failed.
- `Expected failure flag` must invert the accumulated effect of all checks.
Having flag as an additional check cannot catch usecase,
when test is failed only by producing wrong stdout.
This commit extracts this flag out of check list.
^KT-59288
Vladimir Sukharev
85882413db