[skip changelog] Fix integration tests not deleting folders when test finishes

[silvanocerza]

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• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)

• What kind of change does this PR introduce?

Fixes integration tests failing on CI.

• What is the current behavior?

Folders used by integration tests are not deleted, this causes disk space filling up in the CI and make it fail.

• What is the new behavior?

Folders are now deleted when they reach the end of their scope. This way the disk space won't fill up and the CI won't fail.

• Does this PR introduce a breaking change, and is titled accordingly?

Nope.

• Other information:

I actually thought that this was already done with #943 but turns out that I commented out the folders removal. 🤦

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[silvanocerza]

All checks are clear, PR approved, merging and rebasing failing PRs on top.