Ease debugging, fix some CI issues, tweak folder structure (#200)

* Enable debug for OTP versions' listings

* Make it easier to detect

* Prevent error annotation on expected error

The fact that one mirror fails in the above test and others follow
working is test enough for me

A single failing mirror should fail, but it's confusing to have
an error annotation for a success (via continue-on-error) while
not being able to suppress it via GitHub Actions

* Trying to figure out why we have a rebar_core exception

Might simply be that the bug is already fixed and we need to bump rebar3

* Try to debug into non-JSON input

* Prevent error in rebar_core

We're getting Access Denied for
Fetching registry from "https://repo.hex.pm:443/registry.ets.gz?"

* Try to figure out what's breaking tests

* Make jsonParse(...).map failure more understandable

* Ease test maintenance

* Tweak folder structure while moving console._ to core._

package.json

@@ -4,12 +4,12 @@
   "private": true,
   "scripts": {
     "build": "ncc build src/setup-beam.js --no-cache",
-    "format": "prettier src/**/*.js --write && prettier __tests__/**/*.js --write",
-    "jslint": "eslint src/**/*.js && eslint __tests__/**/*.js",
+    "format": "prettier src/**/*.js --write && prettier test/**/*.js --write",
+    "jslint": "eslint src/**/*.js && eslint test/**/*.js",
     "licenses": "yarn licenses generate-disclaimer > 3RD_PARTY_LICENSES",
     "markdownlint": "markdownlint *.md",
     "shellcheck": "shellcheck src/install-*.sh .github/workflows/*.sh",
-    "test": "node __tests__/setup-beam.test.js && node ./__tests__/problem-matchers.test.js",
+    "test": "node test/setup-beam.test.js && node ./test/problem-matchers.test.js",
     "yamllint": "yamllint .github/workflows/**.yml && yamllint .*.yml && yamllint *.yml",
     "build-dist": "npm install && npm run build && npm run format && npm run markdownlint && npm run shellcheck && npm run yamllint && npm run jslint"
   },