Improve Terraform plan result handling

[golemiso]

What this PR does / why we need it:

• Make it possible to handle terraform plan results when:
  • adding new outputs
  • removing resources from state using removed block
  • refactoring *.tf files using moved block

without these modifications, pipecd returns no changes or unable to parse plan output.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):