Module auto planning not compatible with OpenTofu syntax changes

[lauraseidler]

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Overview of the Issue

When using ATLANTIS_AUTOPLAN_MODULES and using OpenTofu with dynamic providers (which are currently not supported by Terraform), module dependencies cannot be loaded.

Reproduction Steps

Make Atlantis run with ATLANTIS_AUTOPLAN_MODULES on a project that has a dynamic provider configuration, which is valid for OpenTofu, for example:

locals {
  projects = toset(["my-project-1", "my-project-2"])
}

provider "google" {
  for_each = local.projects

  alias   = "project"
  project = each.key
}

data "google_service_account" "all" {
  for_each = local.projects

  provider   = google.project[each.key]
  account_id = "my-service-account"
}

Logs

Logs

error(s) loading project module dependencies: my-stack/provider.tf:52 - Invalid provider reference: Provider argument requires a provider name followed by an optional alias, like \"aws.foo\".","json":{"repo":"my-repo","pull":"24"},"stacktr
ace":"github.com/runatlantis/atlantis/server/events.(*DefaultProjectCommandBuilder).getMergedProjectCfgs\n\tgithub.com/runatlantis/atlantis/server/events/project_command_builder.go:401\ngithub.com/runatlantis/atlantis/server/events.(*DefaultProjectCommandBuilder).buildAllCommandsByCfg\n\tgithub.com/runatlantis/atlantis/server/events/project_command_builder.go:532\ngithub.com/runatlantis/atlantis/server/events.(*DefaultProjectCommandBuilder).BuildAutoplanCommands\n\tgithub.com/runatlantis/atlantis/server/events/project_command_builder.go:257\ngithub.com/runatlantis/atlantis/server/events.(*InstrumentedProjectCommandBuilder).BuildAutoplanCommands.func1\n\tgithub.com/runatlantis/atlantis/server/events/instrumented_project_command_builder.go:29\ngithub.com/runatlantis/atlantis/server/events.(*InstrumentedProjectCommandBuilder).buildAndEmitStats\n\tgithub.com/runatlantis/atlantis/server/events/instrumented_project_command_builder.go:71\ngithub.com/runatlantis/atlantis/server/events.(*InstrumentedProjectCommandBuilder).BuildAutoplanCommands\n\tgithub.com/runatlantis/atlantis/server
/events/instrumented_project_command_builder.go:26\ngithub.com/runatlantis/atlantis/server/events.(*PlanCommandRunner).runAutoplan\n\tgithub.com/runatlantis/atlantis/server/events/plan_command_runner.go:94\ngithub.com/runatlantis/atlantis/server/events.(*PlanCommandRunner).Run\n\tgithub.com/runatlantis/atlantis/server/events/plan_command_runner.go:319\ngithub.com/runatlantis/atlantis/server/events.(*DefaultCommandRunner).RunAutoplanCommand\n\tgithub.com/runatlantis/atlantis/server/events/command_runner.go:251

Environment details

• Atlantis version: v0.37.1