esp32: Deactivate wakeup trigger after first wakeup

The files updated according to code review discussions.
In the sleep_modes.c removed immidiate disable of ULP  mode and leave just trigger deactivation.
The esp_sleep.h is updated to have the same defines for source as esp_sleep_wakeup_cause_t.
Updated documentation in sleep_modes.rst file to include cross references and address esp_sleep_wakeup_cause_t type.
Some minor changes in test_sleep.c unit test.

(TW#18952)
Closes https://github.com/espressif/esp-idf/issues/1677

docs/api-reference/system/sleep_modes.rst

@@ -142,7 +142,7 @@ Checking sleep wakeup cause
 The following function can be used to check which wakeup source has triggered wakeup from sleep mode. For touch pad and ext1 wakeup sources, it is possible to identify pin or touch pad which has caused wakeup.
 
 .. doxygenfunction:: esp_sleep_get_wakeup_cause
-.. doxygenenum:: esp_sleep_wakeup_cause_t
+.. doxygentypedef:: esp_sleep_wakeup_cause_t
 .. doxygenfunction:: esp_sleep_get_touchpad_wakeup_status
 .. doxygenfunction:: esp_sleep_get_ext1_wakeup_status