test: re-enable flux testing #3841

Job	Run time
test (1.10, ubuntu-latest, core_layers)	19m 59s
downgrade	1h 37m 37s
test (1.10, ubuntu-latest, normalize_layers)	19m 15s
test (1.10, ubuntu-latest, recurrent_layers)	28m 10s
test (1.10, ubuntu-latest, autodiff)	47m 40s
test (1.10, ubuntu-latest, misc)	35m 22s
test (1.10, ubuntu-latest, reactant)	1h 0m 42s
test (1, ubuntu-latest, core_layers)	29m 26s
test (1, ubuntu-latest, normalize_layers)	23m 2s
test (1, ubuntu-latest, recurrent_layers)	32m 40s
test (1, ubuntu-latest, autodiff)	50m 21s
test (1, ubuntu-latest, misc)	52m 59s
test (1, ubuntu-latest, reactant)	1h 26m 53s
test (1, macos-latest, all)	5h 2m 21s
test (1, windows-latest, all)	1h 39m 11s
	16h 25m 38s

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