the binary size check in example test was removed long time ago. Now we
have updated ttfw_idf to raise exception when performance standard is
not found. These fake performance check will be regarded as error.
Remove them now.
This commit adds one example test case for OTA with SPIRAM
enabled configuration. Additionally it also keeps
`SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY` enabled to catch any issues
of sort "cache disabled but cached region accessed".
https://github.com/espressif/esp-idf/issues/5354