[CX-0136 - PCF Use Case] Update sequence diagrams related to R25.09 improvements

Standard
CX-0136: Use Case PCF

Version
None

Release
R25.09: CX-Saturn

The sequence diagrams for PCF exchange need update following endpoint adjustments proposed in [Change Request CX-0136 Use Case PCF](https://github.com/catenax-eV/product-standardization-prod/issues/297), i.e. the CustomerPartId Improvement:
https://github.com/catenax-eV/cx-com-sustainability/issues/17

Involved Members
@lkschl @finnhonsberg

Start by locating the PCF exchange sequence diagrams in this repository. Read Change Request CX-0136 Use Case PCF and the CustomerPartId Improvement issue to identify the endpoint adjustments, then update the affected diagrams. Done means the diagrams accurately reflect the R25.09 changes described in those linked issues.

Written by the indexing model from the issue text.