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._

.github/workflows/hexpm-mirrors.yml

@@ -35,24 +35,3 @@ jobs:
             https://mirror.invalid
             https://cdn.jsdelivr.net/hex
             https://builds.hex.pm
-
-  test-invalid-mirror:
-    name: Test errors with mirror
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: actions/checkout@v3
-      - name: Use erlef/setup-beam
-        id: failing-setup-beam
-        uses: ./
-        continue-on-error: true
-        with:
-          otp-version: '24.3.4.6'
-          elixir-version: 'v1.13.4'
-          install-rebar: true
-          install-hex: true
-          hexpm-mirrors: https://mirror.invalid
-      - name: Report unexpected success
-        if: ${{ steps.failing-setup-beam.outcome == 'success' }}
-        run: |
-          echo "Action is expected to fail"
-          exit 1