[Feature]: Increase usage of generation for provider docs

[ctreatma]

Description

In v2 we adopted terraform-plugin-docs to enable generation of provider docs from provider code. In the initial migration we created templates from the existing docs to minimize the amount of change introduced in a single PR. This means that even though we use terraform-plugin-docs, we are still generally using it with hand-written, hard-coded templates that are simply copied from templates/ to docs/. This results in gaps between the attributes that are supported by a given resource or data source and the attributes that are mentioned in the docs.

To reduce this gap we should do one of the following for every custom template in templates/data-sources and templates/resources:

• Remove the template and use the default template instead
• Update the template to replace the schema documentation with a reference to {{ .SchemaMarkdown | trimspace }}

An example of the first approach can be seen in #719.

New or Affected Terraform Resources

This affects documentation for all resources and data sources

Potential Terraform Configuration

This is a documentation change and does not impact terraform configuration