some linting, some midje test migration, some new tests

[gkspranger]

• src/yetibot/core/webapp/routes/api.clj
  • kondo cleaned unused libs, refs, and "vars"
  • please keep an eye on my drop of token and channel << don't see being used, but (binding) sometimes still confuses me
• src/yetibot/core/webapp/routes/graphql.clj
  • kondo cleaned unused refs
• added minor tests for test/yetibot/core/test/webapp/routes/api.clj
• test/yetibot/core/test/webapp/routes/graphql.clj
  • migrated tests to midje
  • added some new tests
• added minor test for test/yetibot/core/test/webapp/routes/healthz.clj

[codecov[bot]]

Codecov Report

Merging #179 (2a5cded) into master (0612017) will increase coverage by 0.39%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   51.37%   51.77%   +0.39%     
==========================================
  Files          94       94              
  Lines        4132     4131       -1     
  Branches      197      202       +5     
==========================================
+ Hits         2123     2139      +16     
+ Misses       1812     1790      -22     
- Partials      197      202       +5     

Impacted Files	Coverage Δ
src/yetibot/core/webapp/routes/graphql.clj	92.59% <ø> (ø)
src/yetibot/core/webapp/routes/api.clj	70.00% <100.00%> (+55.71%)	:arrow_up:
src/yetibot/core/commands/help.clj	23.68% <0.00%> (+2.63%)	:arrow_up:
src/yetibot/core/webapp/routes/healthz.clj	44.44% <0.00%> (+22.22%)	:arrow_up:

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