Add default project to organization default settings

[netramali]

Description

In atlas, we can now update the default project hence we need to add default project id to the organization default settings.

Note:

• I have added default project to the importer as well, is this a needed change?
• Cleaning up resources for a default project is a little tricky because default project cannot be deleted so, while testing I needed to set the default project to be the original default project to be able to delete the resource.

Remember to:

• Update the Change Log
• Update the Documentation

External links

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• go-tfe documentation
• API documentation
• Jira

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[ctrombley]

Shouldn't we be setting values for default_agent_pool_id and default_project_id in the resourceTFEOrganizationDefaultSettingsRead method?

Something like:

	if organization.DefaultAgentPool != nil {
		d.Set("default_agent_pool_id", organization.DefaultAgentPool.ID)
	}

	if organization.DefaultProject != nil {
		d.Set("default_project_id", organization.DefaultProject.ID)
	}

When I was smoke testing I noticed that manual drift is not detected by the provider, and I think this is the reason why. I know that default_agent_pool_id is out of the scope of this PR, but if we include it here we will probably be patching a bug that hasn't been reported yet.

The manual drift scenario is probably worth including in an acceptance test as well.

[netramali]

@ctrombley What do you mean by create a test for manual drift scenario?

[netramali]

@ctrombley I tried testing this out and the states is out of sync with config, so you need to apply again. It leads to a non-empty apply.