Some config options, like IDF_TARGET, are present in
sdkconfig.defaults even though they are promptless. The build system
handles them manually and passes them to esp-idf-kconfig via
config.env. However, esp-idf-kconfig reports them like a normal
promptless symbol, which causes confusion.
This commit adds KCONFIG_PROMPTLESS_NO_WARN — a semicolon-separated
list of config option names that, even though promptless, should be
excluded from the report.
Closes https://github.com/espressif/esp-idf/issues/18441
4ad408da59