Fix integration tests for Magento_Backend and Magento_Bundle

[simsComputing]

Description (*)

I have fixed all integration tests on Magento_Backend and Magento_Bundle. For the first one it was about rewriting the test to adapt it to the class's new dependencies.
For the second one it was about fixing Magento.

I added fixes for the Magento_CatalogInventory module. It was about fixing the integration with the new ParentItemProcessInterface

Fixed Issues (if relevant)

I cannot access github issues on the mage-os repo. So here is the taiga ticket :

Fix all broken integration tests

But the PR for now does not fix all integration tests. it will be a long way to go.

Manual testing scenarios (*)

First make sure you're in the dev/tests/integration folder. then :

1. ../../../vendor/bin/phpunit testsuite/Magento/Backend
2. ../../../vendor/bin/phpunit testsuite/Magento/Bundle
3. ../../../vendor/bin/phpunit testsuite/Magento/CatalogInventory

You should have 0 broken test

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[rhoerr]

Hi! Just wondering, should we have this be a draft PR for now, while you work on more fixes? Or do you want to split your work into multiple PRs, and have us process this one now as-is?

It might be good to do multiple PRs, so that each individual PR is smaller for review. That way we could get things merged faster and more often for you, too.

[humeauantadis]

Hi @rhoerr , yes of course you're right. Plus i should rewrite the description of the PR since it now contains a few more things.
I can stop here on that PR. Should we split the taiga task also ?