chore: import upstream snapshot with attribution

examples/custom_bootloader/bootloader_extra_dir/check_bootloader_component.cmake

@@ -0,0 +1,32 @@
+# SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+
+file(READ "${PROJECT_DESCRIPTION}" project_description)
+string(JSON component_count LENGTH "${project_description}" build_components)
+
+set(build_components)
+if(component_count GREATER 0)
+    math(EXPR last_component_index "${component_count} - 1")
+    foreach(component_index RANGE 0 ${last_component_index})
+        string(JSON component_name GET "${project_description}" build_components ${component_index})
+        if(NOT component_name STREQUAL "")
+            list(APPEND build_components "${component_name}")
+        endif()
+    endforeach()
+endif()
+
+string(REPLACE "," ";" expected_components "${EXPECTED_COMPONENTS}")
+foreach(expected_component ${expected_components})
+    list(FIND build_components "${expected_component}" component_index)
+    if(component_index EQUAL -1)
+        message(FATAL_ERROR "${expected_component} was not included in the bootloader build")
+    endif()
+endforeach()
+
+string(REPLACE "," ";" ignored_components "${IGNORED_COMPONENTS}")
+foreach(ignored_component ${ignored_components})
+    list(FIND build_components "${ignored_component}" component_index)
+    if(NOT component_index EQUAL -1)
+        message(FATAL_ERROR "${ignored_component} was included in the bootloader build")
+    endif()
+endforeach()