Add target endpoint to `CommissioningWindowOpener` #84955

Job	Run time
REPL Tests - Linux	1h 0m 4s
Test Suites - Darwin (no-ble-asan-clang)	1h 11m 14s
Test Suites - Linux (no-ble-tsan-clang)	1h 33m 46s
Test Suites - Darwin (no-ble-tsan-clang)	1h 48m 37s
REPL Tests - Darwin	0s
	5h 33m 41s

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