Enable generated validation tests.

Also move strided_slice_invalid_output_dims to spec directory.

Tests tagged by ExpectFailure are expected to fail gracefully during
compilation or execution. Updated the documentation.

Bug: 132155416
Test: NNT_static
Test: 1.2 VTS
Change-Id: I1f747cf289e78fdd6e04c7d8e51b71468d72237c
Merged-In: I1f747cf289e78fdd6e04c7d8e51b71468d72237c
(cherry picked from commit f1919e85ed072baf0a57535198374982cd477dc8)
12 files changed