JointController: allow braking to be disabled in force mode #56

Job	Run time
test / matrix-prep-bazelversion	6s
test / matrix-prep-os	3s
test / test (ubuntu-latest, 8.0.0, ., true)	49m 59s
test / test (ubuntu-latest, 7.3.1, ., true)	49m 57s
	1h 40m 5s

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