[tcat] implement decommissioning in tcat_agent (#10415)

Commits adds handling of TCAT TLV 0x60 `kTlvDecommission`.

tests/scripts/expect/cli-tcat-decommission.exp

@@ -0,0 +1,64 @@
+#!/usr/bin/expect -f
+#
+#  Copyright (c) 2024, The OpenThread Authors.
+#  All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions are met:
+#  1. Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#  2. Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#  3. Neither the name of the copyright holder nor the
+#     names of its contributors may be used to endorse or promote products
+#     derived from this software without specific prior written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+#  POSSIBILITY OF SUCH DAMAGE.
+#
+
+source "tests/scripts/expect/_common.exp"
+
+spawn_node 1 "cli"
+
+switch_node 1
+send "tcat start\n"
+expect_line "Done"
+
+spawn python "tools/tcat_ble_client/bbtc.py" --simulation 1 --cert_path "tools/tcat_ble_client/auth"
+set py_client "$spawn_id"
+expect_line "Done"
+send "commission\n"
+expect_line "\tTYPE:\tRESPONSE_W_STATUS"
+expect_line "\tVALUE:\t0x00"
+
+send "thread start\n"
+expect_line "\tTYPE:\tRESPONSE_W_STATUS"
+expect_line "\tVALUE:\t0x00"
+
+send "decommission\n"
+expect_line "\tTYPE:\tRESPONSE_W_STATUS"
+
+send "exit\n"
+expect eof
+
+switch_node 1
+send "tcat stop\n"
+expect_line "Done"
+
+send "dataset active\n"
+expect_line "Error 23: NotFound"
+
+send "networkkey\n"
+expect_line "00000000000000000000000000000000"
+expect_line "Done"