Workaround s390 clients delete

[maximenoel8]

Context

The deletion of s390 clients using terraform destroy is failing due to the issue described in #26502. This problem is currently blocking the BV cleanup pipeline and the ability to clean up the BV environment using Terraform.

Since a long-term solution is not expected soon, this PR introduces a temporary workaround to address the issue.

What does this PR do?

Bash Script

• Introduces a new script, delete_s390_guest, to manually remove the s390 minion.
• Removes s390 modules from the Terraform state file (tfstate) to prevent conflicts during environment cleanup.

Cleanup Pipeline

• Updates the cleanup pipeline to execute the new bash script before running Terraform commands.
• This ensures the environment is properly cleaned and avoids the issue when invoking terraform destroy.

[srbarrios]

Be caution here, as we have a set +x on the line above, it might be printing credentials visibile from the Jenkins web, that we might not want to show.

[srbarrios]

That binary is already part of our IaC in the infrastructure repo?

[Bischoff]

No, but I can add it, as well as its friend list_s390_clients.

It will make sense on the workers even when the workaround is gone. As a convenience.

[srbarrios]

Thank you Eric, if it's a dependency for our pipeline, yes we need it automated.

[Bischoff]

After the workaround is removed (hopefully before it snows in hell...) it won't be a dependency anymore for our pipelines.

[Bischoff]

"The deletion of s390 clients using terraform destroy is failing due to the issue described in #26502." --> Do we have a 26502, or is it a typo ? There's no link