Remove all Catena-X (NG) references

[stephanbcbauer]

This issue tracks the removal of all occurrences of CatenaX-ng in this repository as part of the broader goal to deprecate this organization.

• Search for Catena-X (NG) in code, configuration, and documentation.
• Remove or adapt references accordingly.
• Close this issue once zero references remain.

Use this query to track your progress (overall): GitHub Search Query

This query should display only results in related repository

Work summarized in eclipse-tractusx/sig-release#838