[tests] Use larger app partition for esp32-c6-idf component builds

The default IDF partition leaves only 1.75MB for the app which is too small for
grouped tests (bluetooth_proxy currently overflows). Match esp32-idf, esp32-c2-idf,
esp32-c3-idf and esp32-s3-idf by switching the c6 base config to partitions_testing.csv.

esphome/components/esp32/core.cpp

@@ -3,7 +3,6 @@
 #include "esphome/core/application.h"
 #include "esphome/core/defines.h"
 #include "preferences.h"
-#include <esp_attr.h>
 #include <freertos/FreeRTOS.h>
 #include <freertos/task.h>
 
@@ -15,14 +14,10 @@ extern "C" __attribute__((weak)) void initArduino() {}
 namespace esphome {
 
 // HAL functions live in hal.cpp. This file keeps only the loop task setup.
-// Force the static TCB and stack into internal DRAM. Otherwise the linker may
-// place them in PSRAM under configs like CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY,
-// which is unsafe when CONFIG_SPIRAM_XIP_FROM_PSRAM is enabled because the running
-// task's stack must be reachable while the flash cache is disabled.
-TaskHandle_t loop_task_handle = nullptr;        // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
-static StaticTask_t DRAM_ATTR loop_task_tcb{};  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
-static StackType_t DRAM_ATTR
-    loop_task_stack[ESPHOME_LOOP_TASK_STACK_SIZE]{};  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+TaskHandle_t loop_task_handle = nullptr;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+static StaticTask_t loop_task_tcb;        // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+static StackType_t
+    loop_task_stack[ESPHOME_LOOP_TASK_STACK_SIZE];  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
 
 void loop_task(void *pv_params) {
   setup();

tests/test_build_components/build_components_base.esp32-c6-idf.yaml

@@ -6,6 +6,9 @@ esp32:
   board: esp32-c6-devkitc-1
   framework:
     type: esp-idf
+  # Use custom partition table with larger app partition (3MB)
+  # Default IDF partitions only allow 1.75MB which is too small for grouped tests
+  partitions: ../partitions_testing.csv
 
 logger:
   level: VERY_VERBOSE