Refactor and update configuration for single channel mode

- Created `test_relay_chn_tilt_multi.c` and `test_relay_chn_tilt_single.c` to implement comprehensive tests for the tilt functionality of relay channels, covering various scenarios including transitions between states and sensitivity settings.
- Introduced a new partition table in `partitionTable.csv` for proper memory management.
- Updated `sdkconfig` to set the relay channel count to 1 for single channel testing and adjusted related configurations.
- Added default configuration file `sdkconfig.defaults.single` for streamlined testing setup.

test_apps/main/CMakeLists.txt

@@ -1,14 +1,23 @@
 # === These files must be included in any case ===
 set(srcs "test_common.c"
-         "test_app_main.c"
-         "test_relay_chn_core.c"
-         "test_relay_chn_listener.c")
+         "test_app_main.c")
 
-if(CONFIG_RELAY_CHN_ENABLE_TILTING)
-    list(APPEND srcs "test_relay_chn_tilt.c")
+# === Selective compilation based on channel count ===
+if(CONFIG_RELAY_CHN_COUNT GREATER 1)
+    list(APPEND srcs "test_relay_chn_core_multi.c"
+                     "test_relay_chn_listener_multi.c")
+else()
+    list(APPEND srcs "test_relay_chn_core_single.c"
+                     "test_relay_chn_listener_single.c")
 endif()
 
-message(STATUS "srcs=${srcs}")
+if(CONFIG_RELAY_CHN_ENABLE_TILTING)
+    if(CONFIG_RELAY_CHN_COUNT GREATER 1)
+        list(APPEND srcs "test_relay_chn_tilt_multi.c")
+    else()    
+        list(APPEND srcs "test_relay_chn_tilt_single.c")
+    endif()
+endif()
 
 # In order for the cases defined by `TEST_CASE` to be linked into the final elf,
 # the component can be registered as WHOLE_ARCHIVE