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`Military::removeFromSquad`: Add missing history event when unassigning officer #10214

Job	Run time
check-pr	1s
lint / lint	20s
docs / Build linux64	1m 12s
package / Linux / Build linux64	1m 31s
package / Windows / Build win64	7m 59s
test / Windows MSVC / Build win64	6m 27s
test / Linux gcc-12 / Build linux64	1m 40s
test / Linux gcc-10 / Build linux64	1m 28s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	42s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	42s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 10s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	52s
	24m 4s

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