Fix AFR_METADATA_MODE on espressif (#1559)

- esp-idf checks for python dependencies before
 configuring, which breaks metadata upload step in OCW
- This commit marks python dependencies as checked if
 AFR_METADATA_MODE is enabled.

vendors/espressif/boards/esp32/CMakeLists.txt

@@ -11,6 +11,11 @@ endif()
 # -------------------------------------------------------------------------------------------------
 # Compiler settings
 # -------------------------------------------------------------------------------------------------
+# Mark the python dependencies as checked so that esp-idf does not check them since this is not
+# needed when we are only generating metadata and not building the project.
+if(AFR_METADATA_MODE)
+    set(PYTHON_DEPS_CHECKED 1)
+endif()
 
 set(esp_idf_dir "${AFR_VENDORS_DIR}/espressif/esp-idf")
 # Provides idf_import_components and idf_link_components