[ignore me, not merging] WIP hello-world endpoint

[jmthibault79]

Jira ticket: https://broadworkbench.atlassian.net/browse/[ticket_number]

Summary of changes

What

Why

Testing these changes

What to test

Who tested and where

• This change is covered by automated tests
  • NB: Rerun automation tests on this PR by commenting jenkins retest or jenkins multi-test.
• I validated this change
• Primary reviewer validated this change
• I validated this change in the dev environment

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 73.39%. Comparing base (b588430) to head (b128004).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4388      +/-   ##
===========================================
- Coverage    73.40%   73.39%   -0.02%     
===========================================
  Files          157      159       +2     
  Lines        14580    14589       +9     
  Branches      1191     1162      -29     
===========================================
+ Hits         10703    10707       +4     
- Misses        3877     3882       +5     

Files	Coverage Δ
...rkbench/leonardo/http/AppDependenciesBuilder.scala	97.85% <100.00%> (+0.01%)	⬆️
.../dsde/workbench/leonardo/http/api/HttpRoutes.scala	98.43% <100.00%> (+0.05%)	⬆️
...dinstitute/dsde/workbench/leonardo/http/Boot.scala	0.00% <0.00%> (ø)
...workbench/leonardo/http/service/HelloService.scala	0.00% <0.00%> (ø)
...dsde/workbench/leonardo/http/api/HelloRoutes.scala	25.00% <25.00%> (ø)

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