[CORE] Remove a redundant is-adaptive check

[zhztheplayer]

We have a check on isAdaptive when replacing reusable (broadcast) sub-queries in the case of AQE is on.

case a: AdaptiveSparkPlanExec if (isAdaptiveContext && conf.subqueryReuseEnabled) =>
  // cache the subquery

It's an attempt to replace the code with

case a: AdaptiveSparkPlanExec if (conf.subqueryReuseEnabled) =>
  // cache the subquery

Since ideally case a: AdaptiveSparkPlanExec should imply isAdaptiveContext == true.

Related to #1851

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[zhztheplayer]

/Benchmark Velox

[GlutenPerfBot]

===== Performance report for TPCH SF2000 with Velox backend, for reference only ====

query	log/native_4618_time.csv	log/native_master_01_31_2024_f1ed68005_time.csv	difference	percentage
q1	33.95	32.75	-1.191	96.49%
q2	24.20	24.25	0.050	100.21%
q3	37.72	37.43	-0.286	99.24%
q4	37.40	37.40	0.003	100.01%
q5	69.68	70.15	0.473	100.68%
q6	8.32	7.00	-1.321	84.12%
q7	83.62	83.66	0.043	100.05%
q8	84.61	85.87	1.256	101.48%
q9	120.86	124.41	3.547	102.94%
q10	44.20	43.68	-0.523	98.82%
q11	20.56	20.32	-0.241	98.83%
q12	25.14	26.52	1.381	105.49%
q13	45.02	45.62	0.599	101.33%
q14	21.88	19.16	-2.719	87.57%
q15	27.15	28.85	1.706	106.28%
q16	14.05	14.00	-0.051	99.64%
q17	100.84	102.02	1.174	101.16%
q18	148.22	149.84	1.612	101.09%
q19	13.42	12.62	-0.797	94.06%
q20	26.37	26.35	-0.021	99.92%
q21	222.14	228.32	6.184	102.78%
q22	13.73	13.50	-0.231	98.32%
total	1223.07	1233.72	10.649	100.87%

[zhztheplayer]

@rui-mo @zzcclp

[zhztheplayer]

@PHILO-HE

[PHILO-HE]

Looks good! Thanks! cc @zzcclp

[zzcclp]

LGTM, please fix conflicts

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[GlutenPerfBot]

===== Performance report for TPCH SF2000 with Velox backend, for reference only ====

query	log/native_4618_time.csv	log/native_master_02_03_2024_75285bcb8_time.csv	difference	percentage
q1	32.58	33.28	0.696	102.14%
q2	26.42	24.26	-2.152	91.85%
q3	37.59	38.78	1.194	103.18%
q4	38.97	37.64	-1.332	96.58%
q5	69.91	70.97	1.053	101.51%
q6	7.16	8.56	1.393	119.45%
q7	84.75	84.29	-0.452	99.47%
q8	84.57	84.63	0.061	100.07%
q9	122.76	121.75	-1.008	99.18%
q10	44.48	43.29	-1.196	97.31%
q11	19.89	20.58	0.698	103.51%
q12	28.39	26.43	-1.959	93.10%
q13	44.78	45.82	1.034	102.31%
q14	16.37	21.75	5.376	132.84%
q15	29.20	29.07	-0.130	99.56%
q16	12.93	14.30	1.365	110.56%
q17	101.37	103.31	1.935	101.91%
q18	149.11	149.45	0.340	100.23%
q19	12.52	13.09	0.564	104.50%
q20	27.51	26.67	-0.839	96.95%
q21	223.36	222.74	-0.617	99.72%
q22	13.41	13.69	0.276	102.06%
total	1228.04	1234.34	6.299	100.51%