[NPUW] Kokoro updates (#35390)
### Details:
- [Switch to NPUW NONE partitioning for both kokoro
parts](https://github.com/openvinotoolkit/openvino/pull/35390/commits/3f8ba6e93b22f6d07ddf7981dcfa3c0e79553877)
to improve inference performance (though increasing compilation time)
- also fix NPUW model caching for model A
- [Fix issue of LSTMSquences using wrong (full 512) input_length
value](https://github.com/openvinotoolkit/openvino/pull/35390/commits/a0a90d7e687987698863668f0929228044810dfb)
- replace input_lengths value with Parameter
- set input_lengths to the real sequence length
- add m_a_input_lengths parameter for KokoroInferRequest to manage the
parameter
- [set NPUW_FALLBACK_EXEC=false for Kokoro model to avoid caching
problem](https://github.com/openvinotoolkit/openvino/pull/35390/commits/fd9c4240593e253ee49b90ac1e679c06e5419209)
discussed in https://github.com/openvinotoolkit/openvino/pull/35635
Metrics:
- NPU4000:
- Compilation for NPU:
- w/o PR:
- cold: 60s
- PR:
- cold: 52s
- warm: 0.6s
- Performance:
- baseline
- CPU Pytorch
- Real-time Speedup Factor: 4.8x
- CPU OpenVINO
- Real-time Speedup Factor: 3.7x
- w/o PR:
- NPU
- Real-time Speedup Factor: 8x
- PR:
- NPU
- Real-time Speedup Factor: 8.1x
(Real-time Speedup Factor = Generated Audio Length / Inference Time)
### Tickets:
E210201
E211208
E213246
### AI Assistance:
- *AI assistance used: yes*
- replace_input_lengths_with_parameter()
- comments
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Co-authored-by: Sergey Shumihin <sergey.shumihin@intel.com>
