[substitutions] !extend and !remove now support substitutions and jinja (#11203)

tests/unit_tests/fixtures/substitutions/05-extend-remove.approved.yaml

@@ -0,0 +1,9 @@
+substitutions:
+  A: component1
+  B: component2
+  C: component3
+some_component:
+  - id: component1
+    value: 2
+  - id: component2
+    value: 5

tests/unit_tests/fixtures/substitutions/05-extend-remove.input.yaml

@@ -0,0 +1,22 @@
+substitutions:
+  A: component1
+  B: component2
+  C: component3
+
+packages:
+  - some_component:
+      - id: component1
+        value: 1
+      - id: !extend ${B}
+        value: 4
+      - id: !extend ${B}
+        value: 5
+      - id: component3
+        value: 6
+
+some_component:
+  - id: !extend ${A}
+    value: 2
+  - id: component2
+    value: 3
+  - id: !remove ${C}

tests/unit_tests/test_substitutions.py

@@ -4,6 +4,7 @@ from pathlib import Path
 
 from esphome import config as config_module, yaml_util
 from esphome.components import substitutions
+from esphome.config import resolve_extend_remove
 from esphome.config_helpers import merge_config
 from esphome.const import CONF_PACKAGES, CONF_SUBSTITUTIONS
 from esphome.core import CORE
@@ -81,6 +82,8 @@ def test_substitutions_fixtures(fixture_path):
 
             substitutions.do_substitution_pass(config, None)
 
+            resolve_extend_remove(config)
+
             # Also load expected using ESPHome's loader, or use {} if missing and DEV_MODE
             if expected_path.is_file():
                 expected = yaml_util.load_yaml(expected_path)