[Utils]Adding a new constant into wifi_constants.py

Since tests folder is not part of ACTS package, we cannot import
anything from this folder. unless we modify python path. Hence,
move it to utils and use the wifi_constants.py.

Bug: 33493799
Test: Running the affected scripts
Change-Id: I4c3d278646a5a1c2dc33d68c2367430f41580948
diff --git a/acts/framework/acts/test_utils/wifi/wifi_constants.py b/acts/framework/acts/test_utils/wifi/wifi_constants.py
index abdb02d..1810130 100644
--- a/acts/framework/acts/test_utils/wifi/wifi_constants.py
+++ b/acts/framework/acts/test_utils/wifi/wifi_constants.py
@@ -18,3 +18,6 @@
 WIFI_CONNECTED = "WifiNetworkConnected"
 SUPPLICANT_CON_CHANGED = "SupplicantConnectionChanged"
 WIFI_FORGET_NW_SUCCESS = "WifiManagerForgetNetworkOnSuccess"
+
+# These constants will be used by the ACTS wifi tests.
+CONNECT_BY_CONFIG_SUCCESS = 'WifiManagerConnectByConfigOnSuccess'