Delete the deprecated identifier macro (#672)

resolves #669

Author: miles170

CHANGELOG.md

@@ -17,9 +17,8 @@
 
 ## Under the hood
 - Remove deprecated table argument from unpivot ([#671](https://github.com/dbt-labs/dbt-utils/pull/671))
+- Delete the deprecated identifier macro ([#672](https://github.com/dbt-labs/dbt-utils/pull/672))
 - Handle deprecations in deduplicate macro ([#673](https://github.com/dbt-labs/dbt-utils/pull/673))
-
-## Under the hood
 - Fully remove varargs usage in surrogate_key and safe_add ([#674](https://github.com/dbt-labs/dbt-utils/pull/674))
 
 ## Fixes