fix integrate_1d_gauss_kronrod gradient speed #5691

Job	Run time
prim tests (windows-latest)	1m 43s
non-fun mix tests (windows-latest)	1m 43s
misc tests (ubuntu-24.04-arm)	1m 43s
rev tests (windows-11-arm)	1m 48s
prim tests (windows-11-arm)	1m 48s
misc tests (windows-11-arm)	1m 48s
non-fun mix tests (windows-11-arm)	1m 48s
prim tests (ubuntu-24.04-arm)	1m 43s
non-fun mix tests (ubuntu-24.04-arm)	1m 43s
mix fun and prob tests 3 (ubuntu-24.04-arm)	1m 43s
fwd tests (windows-11-arm)	1m 48s
mix fun and prob tests 4 (windows-latest)	1m 43s
rev tests (ubuntu-24.04-arm)	1m 43s
fwd tests (windows-latest)	1m 43s
mix fun and prob tests 3 (windows-latest)	1m 43s
mix fun and prob tests 5 (ubuntu-24.04-arm)	1m 43s
mix fun and prob tests 1 (ubuntu-24.04-arm)	1m 43s
mix fun and prob tests 2 (windows-latest)	1m 43s
misc tests (windows-latest)	1m 43s
fwd tests (ubuntu-24.04-arm)	1m 43s
mix fun and prob tests 1 (windows-11-arm)	1m 43s
mix fun and prob tests 4 (ubuntu-24.04-arm)	1m 43s
mix fun and prob tests 3 (windows-11-arm)	1m 47s
mix fun and prob tests 4 (windows-11-arm)	1m 43s
mix fun and prob tests 2 (windows-11-arm)	1m 47s
mix fun and prob tests 5 (windows-11-arm)	1m 48s
mix fun and prob tests 5 (windows-latest)	1m 43s
mix fun and prob tests 2 (ubuntu-24.04-arm)	1m 43s
mix fun and prob tests 1 (windows-latest)	1m 43s
rev tests (windows-latest)	1m 43s
	52m 8s

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