feat(serviceAccount): adjust error messages

[Phil91]

Description

Adjust the error messages for DELETE: api/administration/serviceaccount/owncompany/serviceaccounts/{serviceAccountId}

Why

To give a more specific error message

Issue

Refs: #986

Assets PR

eclipse-tractusx/portal-assets#399

Checklist

• I have followed the contributing guidelines
• I have performed IP checks for added or updated 3rd party libraries
• I have created and linked IP issues or requested their creation by a committer
• I have performed a self-review of my own code
• I have successfully tested my changes locally
• I have added tests that prove my changes work
• I have checked that new and existing tests pass locally with my changes
• I have commented my code, particularly in hard-to-understand areas

[sonarcloud]

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 SonarCloud