Fix coverage stats

[kachkaev]

I was documenting integration tests and noticed two issues with reported coverage. This PR fixes them.

• We used npx kill-port 3000 in CI, which stopped next start with SIGKILL instead of SIGINT. Abrupt process termination meant that the runtime coverage was not reported. I have temporarily replaced yarn kill-port with kill -2 (i.e. SIGKILL with SIGINT). We can switch back when Add option for kill signal tiaanduplessis/kill-port#48 is closed upstream.

  ↑ this change increased reported code coverage

• We did not have @istanbuljs/nyc-config-typescript in .nycrc.json, which caused some source files to be missing from the list of all files. In particular, all site/src/pages/api/**.ts files were not included into the report. Adding @istanbuljs/nyc-config-typescript made the list of files more complete.

  ↑ this change decreased reported code coverage

Overall coverage has decreased, but this is expected.

[codecov]

Codecov Report

Merging #464 (825a6ee) into main (983acc7) will decrease coverage by 4.14%.
The diff coverage is n/a.

❗ Current head 825a6ee differs from pull request most recent head 68ee025. Consider uploading reports for the commit 68ee025 to get more accurate results

@@            Coverage Diff             @@
##             main     #464      +/-   ##
==========================================
- Coverage   66.42%   62.28%   -4.15%     
==========================================
  Files         183      225      +42     
  Lines        2880     3680     +800     
  Branches      738      891     +153     
==========================================
+ Hits         1913     2292     +379     
- Misses        740     1094     +354     
- Partials      227      294      +67     

Flag	Coverage Δ
site-integration	62.28% <ø> (-4.15%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
site/src/components/mdx/mdx-page-content.tsx	66.12% <0.00%> (-12.91%)	⬇️
...src/pages/api/rewrites/sandboxed-block-demo.api.ts	54.05% <0.00%> (ø)
site/src/lib/api/middleware/db.middleware.ts	100.00% <0.00%> (ø)
...rc/pages/api/users/[shortname]/blocks/index.api.ts	100.00% <0.00%> (ø)
site/src/lib/api/middleware/passport.middleware.ts	100.00% <0.00%> (ø)
site/scripts/create-db-indexes.ts	0.00% <0.00%> (ø)
site/src/lib/api/model/user.model.ts	65.95% <0.00%> (ø)
site/src/pages/api/login-with-login-code.api.ts	47.36% <0.00%> (ø)
site/src/pages/api/upload-user-avatar.api.ts	0.00% <0.00%> (ø)
...src/pages/api/users/[shortname]/types/index.api.ts	100.00% <0.00%> (ø)
... and 40 more

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[teenoh]

Thanks for fixing this 🎉