use oauth lib for oidc

[prmths128]

let the lib do the work instead of building requests and urls uses the well-known endpoint
fixes the urls only working on fief

Description

Please explain the changes you made here.

Related Issue

Please link to the issue this PR resolves: [issue #]

Motivation and Context

Why is this change required? What problem does it solve?

How Has This Been Tested?

Please describe in detail how you tested your changes.

Screenshots (if appropriate):

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

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

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.86%. Comparing base (cc62d32) to head (ff9c46f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1040      +/-   ##
==========================================
+ Coverage   68.73%   68.86%   +0.12%     
==========================================
  Files          41       41              
  Lines        3873     3873              
==========================================
+ Hits         2662     2667       +5     
+ Misses       1211     1206       -5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.