refactor: restructure DIRACCommon to preserve DIRAC directory hierarchy

Reorganize DIRACCommon modules to match the original DIRAC structure:
- Core/Utilities/ClassAd/ClassAdLight.py (utilities belong in Core)
- WorkloadManagementSystem/DB/JobDBUtils.py (preserves original location)
- WorkloadManagementSystem/Utilities/ParametricJob.py (preserves original location)

Update all imports across DIRAC, diracx, and DIRACCommon to use the new
structured paths. Reorganize tests to match the new directory structure.

This maintains the logical organization while enabling proper code migration.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: chrisburr

dirac-common/README.md

@@ -8,8 +8,11 @@ This package solves the circular dependency issue where DiracX needs DIRAC utili
 
 ## Contents
 
-- `DIRACCommon.Utils.ReturnValues`: DIRAC's S_OK/S_ERROR return value system
-- `DIRACCommon.Utils.DErrno`: DIRAC error codes and utilities
+- `DIRACCommon.Core.Utilities.ReturnValues`: DIRAC's S_OK/S_ERROR return value system
+- `DIRACCommon.Core.Utilities.DErrno`: DIRAC error codes and utilities
+- `DIRACCommon.Core.Utilities.ClassAd.ClassAdLight`: JDL parsing utilities
+- `DIRACCommon.WorkloadManagementSystem.DB.JobDBUtils`: Job database utilities
+- `DIRACCommon.WorkloadManagementSystem.Utilities.ParametricJob`: Parametric job utilities
 
 ## Installation
 
@@ -20,7 +23,7 @@ pip install DIRACCommon
 ## Usage
 
 ```python
-from DIRACCommon.Utils.ReturnValues import S_OK, S_ERROR
+from DIRACCommon.Core.Utilities.ReturnValues import S_OK, S_ERROR
 
 def my_function():
     if success:

…IRACCommon/Utils/ClassAd/ClassAdLight.py …n/Core/Utilities/ClassAd/ClassAdLight.pydirac-common/src/DIRACCommon/Utils/ClassAd/ClassAdLight.py renamed to dirac-common/src/DIRACCommon/Core/Utilities/ClassAd/ClassAdLight.py dirac-common/src/DIRACCommon/Utils/ClassAd/ClassAdLight.py renamed to dirac-common/src/DIRACCommon/Core/Utilities/ClassAd/ClassAdLight.py

@@ -14,7 +14,7 @@
 from typing import Any, Callable, cast, Generic, Literal, overload, Type, TypeVar, Union
 from typing_extensions import TypedDict, ParamSpec, NotRequired
 
-from DIRACCommon.Utils.DErrno import strerror
+from DIRACCommon.Core.Utilities.DErrno import strerror
 
 
 T = TypeVar("T")

…rc/DIRACCommon/Utils/ClassAd/__init__.py …ommon/Core/Utilities/ClassAd/__init__.pydirac-common/src/DIRACCommon/Utils/ClassAd/__init__.py renamed to dirac-common/src/DIRACCommon/Core/Utilities/ClassAd/__init__.py dirac-common/src/DIRACCommon/Utils/ClassAd/__init__.py renamed to dirac-common/src/DIRACCommon/Core/Utilities/ClassAd/__init__.py

@@ -0,0 +1 @@
+"""DIRACCommon Core utilities"""

…c-common/src/DIRACCommon/Utils/DErrno.py …src/DIRACCommon/Core/Utilities/DErrno.pydirac-common/src/DIRACCommon/Utils/DErrno.py renamed to dirac-common/src/DIRACCommon/Core/Utilities/DErrno.py dirac-common/src/DIRACCommon/Utils/DErrno.py renamed to dirac-common/src/DIRACCommon/Core/Utilities/DErrno.py

@@ -0,0 +1 @@
+"""DIRACCommon WorkloadManagementSystem DB utilities"""

…on/src/DIRACCommon/Utils/ReturnValues.py …RACCommon/Core/Utilities/ReturnValues.pydirac-common/src/DIRACCommon/Utils/ReturnValues.py renamed to dirac-common/src/DIRACCommon/Core/Utilities/ReturnValues.py dirac-common/src/DIRACCommon/Utils/ReturnValues.py renamed to dirac-common/src/DIRACCommon/Core/Utilities/ReturnValues.py

@@ -6,9 +6,9 @@
 """
 import re
 
-from DIRACCommon.Utils.ClassAd.ClassAdLight import ClassAd
-from DIRACCommon.Utils.ReturnValues import S_OK, S_ERROR
-from DIRACCommon.Utils.DErrno import EWMSJDL
+from DIRACCommon.Core.Utilities.ClassAd.ClassAdLight import ClassAd
+from DIRACCommon.Core.Utilities.ReturnValues import S_OK, S_ERROR
+from DIRACCommon.Core.Utilities.DErrno import EWMSJDL
 
 
 def __getParameterSequence(nPar, parList=[], parStart=1, parStep=0, parFactor=1):