Pull Request Description:

Modify FLN Activation Quantization Holder initialization in model.

• Update model builder to retrieve inside FLN nodes quantization information (from FusingInfo) and use it to initialize the quantizer in the FLNActivationQuantizationHolder.
• Resolve the mismatch between fuseinfo-related strings and method names.

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).