feat(centralidp): create decline_subscription permission

[tfjanjua]

Description

Permission created in in the Client Cl2-CX-Portal

Why

To enable a new backend api, we need to implement a new permission called decline_subscription in the Client Cl2-CX-Portal

Issue

Ref: #232

Corresponding Backend PR

eclipse-tractusx/portal-backend#1171

Checklist

• I have followed the contributing guidelines
• I have added copyright and license headers, footers (for .md files) or files (for images)
• I have performed a self-review of my changes
• I have successfully tested my changes
• I have added comments in the default values.yaml file with helm-docs syntax ('# -- ') if relevant for installation
• I have commented my changes, particularly in hard-to-understand areas

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Phil91]

@tfjanjua could you please rebase and resolve the conflicts? the backend pr is already merged

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[tfjanjua]

@tfjanjua could you please rebase and resolve the conflicts? the backend pr is already merged

Hi @Phil91 , thanks for the backend change merge, conflicts has been resolved and branch has been rebased.