Revert "ci: temporarily disable RS485 related tests"

This reverts commit 983220e216ff7a16798e782eff84123c75a210f4

components/driver/test/test_rs485.c

@@ -281,6 +281,6 @@ static void rs485_master(void)
  * correctness of RS485 interface channel communication. It requires
  * RS485 bus driver hardware to be connected to boards.
 */
-TEST_CASE_MULTIPLE_DEVICES("RS485 half duplex uart multiple devices test.", "[driver_RS485][ignore][test_env=UT_T2_RS485]", rs485_master, rs485_slave);
+TEST_CASE_MULTIPLE_DEVICES("RS485 half duplex uart multiple devices test.", "[driver_RS485][test_env=UT_T2_RS485]", rs485_master, rs485_slave);
 
 #endif

examples/protocols/modbus/serial/example_test.py

@@ -165,7 +165,7 @@ def test_check_mode(dut=None, mode_str=None, value=None):
     return False
 
 
-@ttfw_idf.idf_example_test(env_tag='UT_T2_RS485', ignore=True)
+@ttfw_idf.idf_example_test(env_tag='UT_T2_RS485')
 def test_modbus_communication(env, comm_mode):
     global logger