Remove provider blocks from child modules

[tpdownes]

Submission Checklist

It is a Terraform best practice to only define provider blocks in the root module and to pass providers implicitly or explicitly to child modules. This PR removes unnecessary/conflicting child module provider blocks.

Each resource in the configuration must be associated with one provider configuration. Provider configurations, unlike most other concepts in Terraform, are global to an entire Terraform configuration and can be shared across module boundaries. Provider configurations can be defined only in a root Terraform module.

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