feat: Add feature flag AUTH0_SELF_SERVICE_INTEGRATION

[marlonkeating]

Jira Ticket

Inserting a placeholder for the new SSO stepper, activated using new feature flag AUTH0_SELF_SERVICE_INTEGRATION

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (ef1692d) 82.88% compared to head (b9e97b1) 82.89%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1024      +/-   ##
==========================================
+ Coverage   82.88%   82.89%   +0.01%     
==========================================
  Files         401      402       +1     
  Lines        8727     8735       +8     
  Branches     1800     1805       +5     
==========================================
+ Hits         7233     7241       +8     
  Misses       1455     1455              
  Partials       39       39              

Files Changed	Coverage Δ
...onents/learner-credit-management/BudgetCard-V2.jsx	100.00% <ø> (ø)
.../learner-credit-management/MultipleBudgetsPage.jsx	81.81% <ø> (ø)
...earner-credit-management/MultipleBudgetsPicker.jsx	50.00% <ø> (ø)
...credit-management/LearnerCreditAllocationTable.jsx	95.23% <100.00%> (+1.12%)	⬆️
...nents/settings/SettingsSSOTab/NewSSOConfigForm.jsx	85.71% <100.00%> (+5.71%)	⬆️
...mponents/settings/SettingsSSOTab/NewSSOStepper.jsx	100.00% <100.00%> (ø)
src/config/index.js	100.00% <100.00%> (ø)

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[alex-sheehan-edx]

seems like there's a rebase conflict but lgtm otherwise!