DIG-1584: remove all the unused discovery endpoints

[SonQBChau]

What's new

• Remove all the unused discovery endpoints
  • discover_specimens
  • discover_sample_registrations
  • discover_primary_diagnoses
  • discover_treatments
  • discover_chemotherapies
  • discover_hormone_therapies
  • discover_radiations
  • discover_immunotherapies
  • discover_surgeries
  • discover_follow_ups
  • discover_biomarkers
  • discover_comorbidities
  • discover_exposures
• These endpoints are not in use and could bring privacy concerns
• Refer to this PR if we want to bring back any (unlikely since it would need a new approach)
• Move side_bar discovery to the correct section
• Clean up

How to test

• Open swagger-UI and confirm the endpoints no longer there

Note: don't merge into develop until after demo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.11%. Comparing base (043f103) to head (a8e671b).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #199      +/-   ##
===========================================
+ Coverage    94.45%   95.11%   +0.65%     
===========================================
  Files           34       34              
  Lines         3555     3503      -52     
===========================================
- Hits          3358     3332      -26     
+ Misses         197      171      -26     

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[yavyx]

Unused endpoints are removed, LGTM