[MO] Fix ONNX Clip-11 or higher without min/max inputs

[pavel-esir]

Description: MO has been complaining about ONNX Clip without min. While in ONNX specification these inputs are optional. On the back phase where was ClampNormalizer to deal with it. I just unlocked it by removing unnecessarily strict assert on the Partialnfer of Clamp.

ticket #40312

Code:

• Comments
• Code style (PEP8)
• Transformation generates reshape-able IR
• Transformation preserves original framework node names

Validation:

• Unit tests:
• Framework operation tests: N/A -- no new operations were added
• Transformation tests: N/A
• e2e model test with an update of ./tests/e2e_oss/utils/reshape_utils.py: N/A
• Model Optimizer IR Reader check

Documentation:

• Supported frameworks operations list: N/A
• Supported public models list: N/A
• New operations specification: N/A
• Guide on how to convert the public model: N/A
• User guide update: N/A