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build: disable WiFi WPA2/WPA3-Enterprise support (CONFIG_ESP_WIFI_ENTERPRISE_SUPPORT=n) (#1217)

We only ever join personal-mode APs (WPA2-PSK/WPA3-SAE); the enterprise
(802.1X/EAP) connection path is unused across components/, platform/,
and examples/ (no esp_wifi_sta_enterprise_*/esp_eap_client_*/
esp_wifi_sta_wpa2_ent_* call sites). Disabling it via sdkconfig.defaults
across every board (examples/smoke's 8 board variants + examples/floor)
removes a compiled-in, never-exercised protocol/API family --
attack-surface reduction, not a flash-savings play.

TLS, the mbedTLS certificate bundle, and WPA3-Personal/SAE
(CONFIG_ESP_WIFI_ENABLE_WPA3_SAE / CONFIG_ESP32_WIFI_ENABLE_WPA3_SAE) are
untouched and confirmed still enabled in the generated sdkconfig.

Re-measured smoke flash on this branch (clean A/B build, app
partition 1966080 bytes, before/after CONFIG_ESP_WIFI_ENTERPRISE_SUPPORT):
esp32 1175373 -> 1174833 bytes (-540B, -0.05%); esp32c3 1256296 ->
1255760 bytes (-536B, -0.04%). Both boards got marginally smaller here,
which differs from B1-1275's original recorded deltas (esp32 +168B
larger, esp32c3 -722B) -- that measurement has drifted stale over the
73 commits this branch rebased across. Either way the point stands:
this app's linker --gc-sections was already stripping the unreachable
enterprise code, so the net size effect is a few hundred bytes in
either direction and is not the reason for this change.

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