[jit] Skip NNAPI, test_ivalue, CPU NNC tests in fbcode (#108937)
Summary:
NNAPI: Internal test infra can't find test_nnapi.py. Easiest solution is to just skip these tests if test_nnapi.py can't be found
test_ivalue: fails due to qscheme op not implemented for CPU backend. In OSS, it doesn't run because it's not included in test_jit.py.
CPU NNC tests: test_working_byte_cpu_float32 is failing, but hard to repro; we don't use CPU NNC internally, so let's just skip CPU NNC tests internally.
Differential Revision: D48041615
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108937
Approved by: https://github.com/eellison
