feat: validate oauth scope format

[MichaelGoberling]

Description

Use a regex to validate the oauth scopes format (comma-separated list with no quotes/double-quotes)

(Note: scope validation is already supported with the deprecated jwt step, this is bringing oauth up to par with that)

Related Issue

ACNA-2762

Motivation and Context

How Has This Been Tested?

npm run test

Real valid scope format run

Real invalid scope format run

Real invalid scope format run, specifically using the deprecated jwt format

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (c18dda0) 100.00% compared to head (6c47447) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #51 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 2 2 Lines 102 104 +2 Branches 17 17 ========================================= + Hits 102 104 +2 ```

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