Made deletion of all budget filter projects be recognized (#4731) (#692)
Made deletion of all budget filter projects be recognized (#4731) (#692)

* Enabled imports for billing budget

* Made updates of filter projects get recognized during updates

* Added state migration function

Signed-off-by: Modular Magician <86ce7da8ad74b1c583667a2bebd347455fa06219@google.com>
GoogleCloudPlatform/terraform-google-conversion