[TESTS] Make a common entry point for conformance tests

[kshpv]

Changes

Refactors confromance test suite to enhance maintainability and reduce potential bugs.

1. Unified test entry point
2. Centralized Fail/XFail logic

Reason for changes

1. Reduce code complexity
2. Reduce potential number of bugs

Tests

WC run - https://github.com/openvinotoolkit/nncf/actions/runs/13239414168 - passed
ptq run -job/manual/job/post_training_quantization/616/ - in progress
WC CI - job/manual/job/post_training_weight_compression/317 - passed

[nikita-savelyevv]

Activation sparsity conformance test can't be run in the CI because of some infrastructure problems. Could you please run it on the develop and your branches locally and share the results?

[kshpv]

Local results for sparsity conformance:

PR:

Model	Backend	Metric name	Metric value	Metric diff	Num int8	Num int4	Num FQ	Num sparse activations	Compr. time	Total time	RAM MiB	Status	Build url
timm/deit3_small_patch16_224_qkv_sparse20_fc1_sparse20_fc2_sparse30	CUDA_TORCH	Acc@1	0.8103	-0.0032	0	0	0	36	0:00:16	0:12:10	7370
timm/deit3_small_patch16_224_qkv_sparse20_fc1_sparse20_fc2_sparse30	TORCH	Acc@1	0.8099	-0.0036	0	0	0	36	0:01:07	0:13:03	7707
tinyllama_ffn_sparse20	CUDA_TORCH	Similarity	0.7746	-0.2254	0	0	0	44	0:00:13	0:05:32	2079
tinyllama_ffn_sparse20	TORCH	Similarity	0.79176	-0.20824	0	0	0	44	0:01:30	0:06:52	6218
tinyllama_int8_asym_data_free_ffn_sparse20	CUDA_TORCH	Similarity	0.80373	-0.19627	312	0	0	44	0:00:14	0:02:49	3168
tinyllama_int8_asym_data_free_ffn_sparse20	TORCH	Similarity	0.79003	-0.20997	312	0	0	44	0:01:40	0:04:22	7870

Develop:

Model	Backend	Metric name	Metric value	Metric diff	Num FQ	Num int4	Num int8	Num sparse activations	RAM MiB	Compr. time	Total time	FPS	Status
timm/deit3_small_patch16_224_qkv_sparse20_fc1_sparse20_fc2_sparse30	CUDA_TORCH	Acc@1	0.8103	-0.0032	0	0	0	36	6313	0:00:15	0:12:17
timm/deit3_small_patch16_224_qkv_sparse20_fc1_sparse20_fc2_sparse30	TORCH	Acc@1	0.8099	-0.0036	0	0	0	36	6544	0:01:07	0:13:04
tinyllama_ffn_sparse20	CUDA_TORCH	Similarity	0.7746	-0.2254	0	0	0	44	2014	0:00:13	0:05:33
tinyllama_ffn_sparse20	TORCH	Similarity	0.79176	-0.20824	0	0	0	44	6294	0:01:30	0:06:53
tinyllama_int8_asym_data_free_ffn_sparse20	CUDA_TORCH	Similarity	0.80373	-0.19627	0	0	312	44	3199	0:00:14	0:02:51
tinyllama_int8_asym_data_free_ffn_sparse20	TORCH	Similarity	0.79003	-0.20997	0	0	312	44	8340	0:01:39	0:04:23