Clean the build directory before building the app

[LoicPoullain]

Issue

Resolves #607 (2).

When building the app, the tests, the migrations and the scripts, the build/ folder is not clean up before compiling the files. This may result in keeping in this directory JS files whose TS files have been deleted, causing unexpected behaviors (migrations, spec files, etc).

Solution and steps

• Add and test the util function rmdir.
• Add the command foal rmdir.
• Use foal rmdir build in new projects.

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

[codecov]

Codecov Report

Merging #621 into v1-6-0 will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           v1-6-0     #621      +/-   ##
==========================================
+ Coverage   99.62%   99.63%   +<.01%     
==========================================
  Files          90       90              
  Lines        1589     1632      +43     
  Branches      335      364      +29     
==========================================
+ Hits         1583     1626      +43     
  Misses          6        6

Impacted Files	Coverage Δ
packages/core/src/common/utils/controller.util.ts	100% <0%> (ø)	⬆️
...ages/core/src/common/utils/verify-password.util.ts	100% <0%> (ø)	⬆️
packages/core/src/sessions/token-optional.hook.ts	100% <0%> (ø)	⬆️
packages/core/src/sessions/token-required.hook.ts	100% <0%> (ø)	⬆️
packages/core/src/sessions/set-session-cookie.ts	100% <0%> (ø)	⬆️
...api/metadata-getters/get-api-complete-operation.ts	100% <0%> (ø)	⬆️
packages/core/src/express/create-app.ts	100% <0%> (ø)	⬆️
packages/core/src/express/send-response.ts	100% <0%> (ø)	⬆️
...ackages/core/src/sessions/remove-session-cookie.ts	100% <0%> (ø)	⬆️
packages/core/src/core/routes/utils.ts	100% <0%> (ø)	⬆️
... and 5 more

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