sig#781 - Adjust seeding data to support adding of initial credentials

[evegufy]

Description

The process through which the BPNL and Membership credentials for the initial/operator wallet is added to the Credential Issuer should be improved.
In the current state it requires direct interaction on database level to some extent: https://github.com/eclipse-tractusx/ssi-credential-issuer/blob/v1.1.0/docs/technical-documentation/operator-credential-creation/initial-credential-setup.md

Acceptance Criteria

• Seeding data is enhanced to support adding of initial credentials
• No direct interaction on db level is needed anymore to import the initial/operator wallet

Additional information

implements eclipse-tractusx/sig-release#781

[Phil91]

@evegufy this issue is obsolete since I've adjusted the portal seeding in a way that the onboarding process will run for the operator company to create the wallet and the two credentials afterwards.

@MaximilianHauer fyi