Use humanitec TF module

[TobiasBabin]

⚠️ Do not merge before https://github.com/humanitec/developers-docs/pull/1480 is merged and published.

With the "Get started" tutorial moving to the public workload module https://github.com/humanitec-tf-modules/k8s-workload-kubernetes instead of the tutorial's own implementation, this implementation can be removed from the present backing repo entirely.

Unrelated, but encountered during the update, the PR also changes a deprecated Azure TF provider property to the current one.

[Copilot]

Pull request overview

Removes the repository’s custom Kubernetes workload Terraform module now that the “Get started” tutorial uses the public Humanitec workload module, and updates Azure Terraform configuration to use the current azurerm_federated_identity_credential argument name.

Changes:

• Remove the in-repo modules/workload/kubernetes implementation (variables, main resources, outputs).
• Update Azure azurerm_federated_identity_credential to use user_assigned_identity_id instead of the deprecated parent_id.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
modules/workload/kubernetes/variables.tf	Removes module input variables as part of deleting the old workload module.
modules/workload/kubernetes/main.tf	Removes the Kubernetes Deployment-based workload implementation.
modules/workload/kubernetes/outputs.tf	Removes workload metadata output from the deleted module.
infra/azure/azure.tf	Updates federated identity credential configuration to newer AzureRM provider schema.

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