test: 💍 update selectors for credential-library tests

[cameronperera]

delete and list

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-15468 (Delete)
✅ Closes: https://hashicorp.atlassian.net/browse/ICU-15469 (List)

Description

Screenshots (if appropriate)

How to Test

Checklist

• I have added before and after screenshots for UI changes
• I have added JSON response output for API changes
• I have added steps to reproduce and test for bug fixes in the description
• I have commented on my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

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