Address minor issues identified in 10/24 Code Audit (#1504)

* Update code owners

* Trying xfail PHE tests only on Windows

* Revert change on xfailed tests for PHE

* Update .github/CODEOWNERS

* Update idaes/models_extra/column_models/tests/test_plate_heat_exchanger.py

.github/CODEOWNERS

@@ -23,13 +23,14 @@ conftest.py @lbianchi-lbl
 /idaes/commands/ @dangunter
 
 # Core
-/idaes/core/ @andrewlee94 @dallan-keylogic @lbianchi-lbl
+/idaes/core/ @agarciadiego @dallan-keylogic @lbianchi-lbl
 /idaes/core/dmf/ @dangunter
-/idaes/core/surrogate/ @andrewlee94 @bpaul4 @avdudchenko @rundxdi
+/idaes/core/surrogate/ @bpaul4 @avdudchenko @rundxdi
 /idaes/core/ui/ @dangunter
 
 # Models
-/idaes/models/ @andrewlee94 @bpaul4
+/idaes/models/ @agarciadiego @bpaul4
+/idaes/models/properties/ @agarciadiego @dallan-keylogic 
 
 # Apps - each package needs a maintainer
 /idaes/apps/caprese/ @Robbybp

idaes/models_extra/column_models/tests/test_plate_heat_exchanger.py

@@ -14,15 +14,17 @@
 Tests for Plate Heat Exchnager  unit model.
 Author: Akula Paul
 """
-
 import pytest
+
 from pyomo.environ import (
     check_optimal_termination,
     ConcreteModel,
     Param,
     units as pyunits,
     value,
 )
+from pyomo.util.check_units import assert_units_consistent, assert_units_equivalent
+
 from idaes.core import FlowsheetBlock
 from idaes.models_extra.column_models.plate_heat_exchanger import (
     PlateHeatExchanger as PHE,
@@ -37,7 +39,6 @@
 from idaes.core.util.model_statistics import degrees_of_freedom
 from idaes.core.util.testing import initialization_tester
 from idaes.core.solvers import get_solver
-from pyomo.util.check_units import assert_units_consistent, assert_units_equivalent
 
 
 # -----------------------------------------------------------------------------
@@ -66,8 +67,9 @@ def test_config():
 
 
 workaround_for_1294 = pytest.mark.xfail(
+    # the failures only occur for Windows on GHA with Python <3.12, and Linux with Python 3.12
     reason="These tests fail with Pyomo 6.7.0. See IDAES/idaes-pse#1294 for details",
-    strict=False,  # the failures only occur for certain platforms, e.g. Windows on GHA
+    strict=False,
 )