[dua] remove OPENTHREAD_CONFIG_DUA_ENABLE build feature (#13165)

This commit completely removes the local Domain Unicast Address (DUA)
registration feature flag (OPENTHREAD_CONFIG_DUA_ENABLE) and all of
its associated implementation, public APIs, CLI commands, Spinel
property handlers, and certification tests.

Thread 1.2 FTD Border Router/Router DUA proxying features for MTD
children (OPENTHREAD_CONFIG_TMF_PROXY_DUA_ENABLE) are preserved and
updated to only compile/instantiate components when proxy DUA
features are active.

Detailed Changes:
- Remove default definition of OPENTHREAD_CONFIG_DUA_ENABLE from
  misc.h.
- Remove OT_DUA and openthread_config_dua_enable from CMake/GN
  configs.
- Remove otThreadSetFixedDuaInterfaceIdentifier and
  otThreadGetFixedDuaInterfaceIdentifier from
  include/openthread/thread.h
  and implementation src/core/api/thread_api.cpp.
- Remove CLI DUA interpreter from src/cli/cli.cpp.
- Remove SPINEL_CAP_DUA capability and SPINEL_PROP_THREAD_DUA_ID
  Spinel property handlers and dispatchers from NCP.
- Strip local DUA management features (conflict checking, SLAAC DUA
  interface identifiers, and dad info settings) from DuaManager, MLE,
  Address Resolver, and settings.
- Clean up Notifier, TimeTicker, and TMF dispatcher guards.
- Clean up -DOT_DUA=ON compilation flags across build/test scripts.
- Delete obsolete DUA certification tests:
  - v1_2_test_domain_unicast_address
  - v1_2_test_domain_unicast_address_registration
  - v1_2_test_dua_handle_address_error

tools/harness-simulation/posix/config.yml

@@ -20,7 +20,6 @@ ot_build:
     - "-DOPENTHREAD_CONFIG_IP6_MAX_EXT_MCAST_ADDRS=8"
     options:
     - "-DOT_REFERENCE_DEVICE=ON"
-    - "-DOT_DUA=ON"
     - "-DOT_MLR=ON"
     - "-DOT_COMMISSIONER=ON"
     - "-DOT_JOINER=ON"
@@ -35,7 +34,6 @@ ot_build:
     - "-DOPENTHREAD_CONFIG_IP6_MAX_EXT_MCAST_ADDRS=8"
     options:
     - "-DOT_REFERENCE_DEVICE=ON"
-    - "-DOT_DUA=ON"
     - "-DOT_MLR=ON"
     - "-DOT_COMMISSIONER=ON"
     - "-DOT_JOINER=ON"
@@ -57,7 +55,6 @@ ot_build:
     - OT_COMMISSIONER=1
     options:
     - "-DOTBR_DUA_ROUTING=ON"
-    - "-DOT_DUA=ON"
     - "-DOT_MLR=ON"
     rcp_subpath: build/ot12/simulation
     rcp_options:
@@ -76,7 +73,6 @@ ot_build:
     - EXTERNAL_COMMISSIONER=1
     options:
     - "-DOTBR_DUA_ROUTING=ON"
-    - "-DOT_DUA=ON"
     - "-DOT_MLR=ON"
     rcp_subpath: build/ot13/simulation
     rcp_options:

tools/otci/otci/otci.py

@@ -2594,23 +2594,6 @@ class OTCI(object):
         """Set the Thread Domain Name for Thread 1.2 device."""
         self.execute_command(f'domainname {self.__escape_escapable(name)}')
 
-    def get_dua_iid(self) -> str:
-        """Get the DUA IID for Thread 1.2 device."""
-        raw_iid = self.execute_command('dua iid')
-        if raw_iid:
-            return self.__parse_iid(raw_iid)
-        else:
-            return ''
-
-    def set_dua_iid(self, iid: str):
-        """Set the DUA IID for Thread 1.2 device."""
-        self.__validate_iid(iid)
-        self.execute_command(f'dua iid {iid}')
-
-    def clear_dua_iid(self):
-        """Clear the DUA IID for Thread 1.2 device."""
-        self.execute_command('dua iid clear')
-
     # TODO: mlr reg <ipaddr> ... [timeout]
 
     #

tools/otci/tests/test_otci.py

@@ -135,10 +135,6 @@ class TestOTCI(unittest.TestCase):
         self.assertEqual('fd00:dba::/64', leader.get_mesh_local_prefix())
         leader.set_mesh_local_prefix(TEST_MESH_LOCAL_PREFIX + '/64')
         leader.set_ml_iid('b1a5ed57a71571c5')
-        leader.set_dua_iid('ad4a011dad4a011d')
-        self.assertEqual('ad4a011dad4a011d', leader.get_dua_iid())
-        leader.clear_dua_iid()
-        self.assertEqual('', leader.get_dua_iid())
 
         self.assertFalse(leader.get_ifconfig_state())
         # ifconfig up