chore: fix Upload coverage results to Coveralls / coveralls

[kenjis]

Description
Fixes #7941

Fixes the following error:

PHP Fatal error: Uncaught Error: Class "Config\Autoload" not found in /home/runner/work/CodeIgniter4/CodeIgniter4/system/Test/Mock/MockAutoload.php:16

Checklist:

• Securely signed commits
• [] Component(s) with PHPDoc blocks, only if necessary or adds value
• [] Unit testing, with >80% coverage
• [] User guide updated
• [] Conforms to style guide

[kenjis]

Coverage report generated!

Run jq '.autoload."psr-4" += {"Config\\": "app/Config/"}' composer.json > temp.json && mv temp.json composer.json
  jq '.autoload."psr-4" += {"Config\\": "app/Config/"}' composer.json > temp.json && mv temp.json composer.json
  composer dump-autoload
  vendor/bin/phpcov merge --clover build/logs/clover.xml build/cov
  shell: /usr/bin/bash -e {0}
  env:
    COMPOSER_PROCESS_TIMEOUT: 0
    COMPOSER_NO_INTERACTION: 1
    COMPOSER_NO_AUDIT: 1
    COMPOSER_CACHE_FILES_DIR: /home/runner/.cache/composer/files
Generating optimized autoload files
Generated optimized autoload files containing 5608 classes
phpcov 8.2.1 by Sebastian Bergmann.

Generating code coverage report in Clover XML format ... done

https://github.com/codeigniter4/CodeIgniter4/actions/runs/6254242090/job/16981942317

[kenjis]

This PR fixes the current GitHub Action check failure.
Please approve.

[paulbalandan]

I think I forgot the reason why. Why do we not add Config\\ psr4 mapping to composer.json in the first place?

[kenjis]

We removed it in #5824

Probably because it is defined in CI4's autoloader from the beginning.

And if we add it, spark namespaces shows it twice.

$ php spark namespaces | grep '| Config'
| Config                            | APPPATH/Config                                               | Yes    |
| Config                            | APPPATH/Config                                               | Yes    |