[WIP] Cred poc

[mrgnr]

Done

• Add scheduling and re-scheduling for exams
• Add embedded exam environment

QA

• Visit https://ubuntu-com-11968.demos.haus/credentialing/schedule to schedule an exam
• Visit https://ubuntu-com-11968.demos.haus/credentialing/your-exams to view and take your scheduled exams

[webteam-app]

Demo starting at https://ubuntu-com-11968.demos.haus

[codecov-commenter]

Codecov Report

Merging #11968 (00652ca) into main (9039d76) will decrease coverage by 0.15%. The diff coverage is n/a.

:exclamation: Current head 00652ca differs from pull request most recent head d432af0. Consider uploading reports for the commit d432af0 to get more accurate results

@@            Coverage Diff             @@
##             main   #11968      +/-   ##
==========================================
- Coverage   63.35%   63.19%   -0.16%     
==========================================
  Files         117      117              
  Lines        2737     2769      +32     
  Branches      808      821      +13     
==========================================
+ Hits         1734     1750      +16     
- Misses        960      975      +15     
- Partials       43       44       +1     

Impacted Files	Coverage Δ
...ubscribe/react/components/Form/Support/Support.tsx	25.92% <0.00%> (-4.08%)	:arrow_down:
...ic/js/src/advantage/subscribe/react/utils/utils.ts	34.92% <0.00%> (+3.17%)	:arrow_up:
...rc/advantage/subscribe/react/utils/FormContext.tsx	85.33% <0.00%> (+3.24%)	:arrow_up: