[CORE][VL] Hide child nodes from implementations of OffloadSingleNode

[zhztheplayer]

Hide child plan nodes from OffloadSingleNode so we can make sure the implementation code is working on a node rather than working on a tree.

So cost-based conditional fallback will be made possible because the rules can be composite arbitrarily in any precedences in rule appliers.

Once an offload rule that needs access to child nodes, user could add a pre-transform or post-transform rule to do that.

[github-actions]

Thanks for opening a pull request!

Could you open an issue for this pull request on Github Issues?

https://github.com/apache/incubator-gluten/issues

Then could you also rename commit message and pull request title in the following format?

[GLUTEN-${ISSUES_ID}][COMPONENT]feat/fix: ${detailed message}

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[GlutenPerfBot]

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

query	log/native_master_04_07_2025_time.csv	log/native_master_04_06_2025_5eecd8d5d0_time.csv	difference	percentage
q1	11.54	11.05	-0.484	95.80%
q2	10.89	12.05	1.159	110.65%
q3	3.13	3.56	0.430	113.71%
q4	50.69	52.96	2.265	104.47%
q5	9.61	7.17	-2.442	74.59%
q6	4.32	4.55	0.229	105.30%
q7	5.40	4.39	-1.010	81.30%
q8	3.48	4.07	0.591	116.98%
q9	15.61	14.46	-1.154	92.61%
q10	11.52	11.80	0.287	102.49%
q11	28.41	28.59	0.179	100.63%
q12	1.78	2.29	0.515	129.03%
q13	6.94	6.47	-0.473	93.18%
q14a	42.93	45.45	2.519	105.87%
q14b	39.73	40.88	1.146	102.88%
q15	2.57	2.14	-0.424	83.47%
q16	4.54	6.51	1.967	143.30%
q17	5.65	6.64	0.985	117.43%
q18	8.44	8.31	-0.139	98.36%
q19	4.15	3.79	-0.351	91.53%
q20	1.97	2.03	0.059	103.02%
q21	1.26	0.87	-0.387	69.30%
q22	2.61	3.94	1.324	150.63%
q23a	62.57	61.46	-1.110	98.23%
q23b	73.69	72.98	-0.713	99.03%
q24a	71.95	74.97	3.014	104.19%
q24b	70.27	67.79	-2.477	96.48%
q25	6.27	5.50	-0.771	87.72%
q26	2.42	2.39	-0.031	98.74%
q27	3.46	2.78	-0.679	80.38%
q28	17.21	17.31	0.101	100.59%
q29	7.48	7.67	0.192	102.56%
q30	5.17	5.80	0.633	112.25%
q31	7.75	7.89	0.136	101.75%
q32	1.83	1.59	-0.237	87.04%
q33	3.43	3.81	0.381	111.10%
q34	3.31	3.75	0.441	113.30%
q35	6.70	7.27	0.563	108.40%
q36	2.59	2.54	-0.051	98.02%
q37	3.35	3.00	-0.346	89.66%
q38	11.29	11.73	0.449	103.98%
q39a	4.37	4.08	-0.295	93.25%
q39b	4.25	4.14	-0.110	97.41%
q40	3.37	3.56	0.192	105.70%
q41	0.64	0.66	0.018	102.78%
q42	0.79	0.55	-0.242	69.42%
q43	2.09	1.95	-0.138	93.37%
q44	6.53	5.97	-0.558	91.45%
q45	3.27	3.51	0.236	107.23%
q46	3.73	3.35	-0.381	89.79%
q47	10.15	9.67	-0.477	95.30%
q48	3.50	3.06	-0.442	87.38%
q49	6.81	5.53	-1.279	81.23%
q50	16.73	17.45	0.722	104.32%
q51	7.49	7.81	0.323	104.32%
q52	0.87	0.77	-0.097	88.83%
q53	1.62	1.74	0.126	107.79%
q54	5.72	5.52	-0.194	96.61%
q55	0.63	0.79	0.157	125.00%
q56	4.62	4.26	-0.361	92.19%
q57	6.35	6.28	-0.072	98.86%
q58	3.60	3.56	-0.030	99.16%
q59	3.94	3.87	-0.078	98.03%
q60	5.37	4.95	-0.421	92.15%
q61	4.29	4.75	0.461	110.74%
q62	2.82	2.89	0.066	102.33%
q63	1.58	1.34	-0.235	85.11%
q64	34.94	35.92	0.981	102.81%
q65	11.14	10.93	-0.213	98.08%
q66	3.56	2.94	-0.621	82.57%
q67	57.82	57.84	0.025	100.04%
q68	3.51	3.15	-0.357	89.83%
q69	5.30	5.27	-0.030	99.43%
q70	5.75	6.02	0.274	104.76%
q71	4.42	5.04	0.624	114.12%
q72	20.27	20.35	0.081	100.40%
q73	2.89	3.16	0.273	109.47%
q74	17.67	16.87	-0.800	95.47%
q75	22.69	22.77	0.075	100.33%
q76	6.78	7.24	0.462	106.82%
q77	2.33	2.48	0.146	106.26%
q78	32.83	34.31	1.480	104.51%
q79	3.83	3.89	0.061	101.60%
q80	9.78	10.92	1.144	111.69%
q81	6.37	6.90	0.529	108.31%
q82	5.32	5.71	0.388	107.29%
q83	2.06	1.54	-0.525	74.54%
q84	2.90	2.44	-0.461	84.13%
q85	6.52	6.64	0.119	101.82%
q86	2.15	1.96	-0.185	91.37%
q87	11.67	11.64	-0.029	99.76%
q88	15.43	15.32	-0.114	99.26%
q89	2.74	2.20	-0.543	80.20%
q90	1.94	2.34	0.398	120.49%
q91	3.95	3.71	-0.240	93.92%
q92	1.50	1.68	0.174	111.58%
q93	23.34	23.73	0.392	101.68%
q94	8.28	8.38	0.099	101.19%
q9	54.89	56.04	1.150	102.09%
q5	1.99	2.29	0.300	115.05%
q96	10.70	10.13	-0.564	94.73%
q97	2.36	2.57	0.210	108.93%
q98	5.34	5.37	0.031	100.57%
q99	0.36	0.56	0.203	156.40%
total	1168.34	1176.45	8.110	100.69%

[GlutenPerfBot]

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

query	log/native_master_04_07_2025_time.csv	log/native_master_04_06_2025_5eecd8d5d0_time.csv	difference	percentage
q1	24.61	25.48	0.868	103.52%
q2	26.21	24.58	-1.632	93.77%
q3	33.16	32.52	-0.645	98.06%
q4	27.80	28.27	0.475	101.71%
q5	60.52	60.58	0.059	100.10%
q6	6.99	8.73	1.734	124.80%
q7	39.83	40.83	0.999	102.51%
q8	60.05	63.42	3.367	105.61%
q9	96.53	90.92	-5.615	94.18%
q10	43.11	41.66	-1.452	96.63%
q11	17.13	16.10	-1.035	93.96%
q12	17.53	17.21	-0.329	98.12%
q13	23.98	25.17	1.197	104.99%
q14	12.53	12.56	0.033	100.27%
q15	26.95	25.49	-1.459	94.59%
q16	12.51	13.28	0.772	106.17%
q17	74.49	73.61	-0.882	98.82%
q18	112.50	116.21	3.703	103.29%
q19	17.49	23.18	5.693	132.55%
q20	25.48	24.17	-1.303	94.88%
q21	171.82	174.01	2.187	101.27%
q22	10.19	11.33	1.136	111.15%
total	941.44	949.31	7.869	100.84%