Changed instances of staff to admin

[printharsh]

Tickets:

• HCK-139

List of changes:

Changed instances of staff to admin.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

How has this been tested?

Ran npm run test.

Questions for code reviewers?

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] I have made corresponding changes to the documentation
• [x] Any dependent changes have been merged and published in downstream modules