Fix failover brokering bug reacting to linkstate changes #7631

Job	Run time
Typos Check	4s
Unit tests on ubuntu-latest	8m 24s
Lints and doc tests on ubuntu-latest	31s
Unit tests on windows-latest	14m 38s
Lints and doc tests on windows-latest	2m 45s
Unit tests on macos-13	11m 18s
Lints and doc tests on macos-13	1m 17s
Unit tests on macos-14	9m 21s
Lints and doc tests on macos-14	43s
Memory leak checks	0s
CI status checks	1s
	49m 2s

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