tests/integration: add {cargo,check}.postprocess stages and enable cargo.postprocess for json-c

The main `postprocess` still isn't implemented,
but now `cargo.postprocess` and `check.postprocess` work.

Author: kkysen

tests/integration/tests/__init__.py

@@ -23,6 +23,8 @@ class Test(object):
         "refactor": ["refactor.gen.sh", "refactor.sh"],
         "cargo.refactor": ["cargo.refactor.gen.sh", "cargo.refactor.sh"],
         "check.refactor": ["check.refactor.sh", "test.sh"],
+        "cargo.postprocess": ["cargo.postprocess.gen.sh", "cargo.postprocess.sh"],
+        "check.postprocess": ["check.postprocess.sh", "test.sh"],
     }
 
     def __init__(self, directory: Path, generated_scripts: set[Path]):

tests/integration/tests/json-c/conf.yml

@@ -22,3 +22,6 @@ refactor:
 
 cargo.refactor:
   autogen: true
+
+cargo.postprocess:
+  autogen: true