fix(validate): add variables support

[darkowlzz]

Enable variables support in meta-parameters processing in validate command.

Fixes #15733, #15894

[apparentlymart]

Thanks for fixing this, @darkowlzz!

[sdot257]

On v0.10.7 and I'm seeing the same issue. As a workaround, I had to set a default and assign null to it.

variable "odata_subnet_id" {
  description = "A internal subnet id"
  default     = ""
}

[smartb-pair]

I'm still seeing behavior like @luckytaxi reported with Terraform v0.11.0.

[spmsaj]

still seeing issue in .11.7

[xakraz]

Same with 0.11.13

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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