[Misc] Catch the exception generated in llumlet constructor

[KuilongCui]

No description provided.

[github-actions]

prefill	p25	p50	p75	p95	p99	mean
latency(ms)	19971.75	74649.50	217705.25	255131.00	260387.04	107789.52

decode	p25	p50	p75	p95	p99	mean
latency(ms)	51.73	57.80	69.59	127.55	245.54	71.13

[github-actions]

migration_size	8.00 MB	16.00 MB	24.00 MB	32.00 MB	40.00 MB	48.00 MB	56.00 MB	64.00 MB	72.00 MB	80.00 MB	88.00 MB	96.00 MB	104.00 MB	112.00 MB	120.00 MB	128.00 MB	136.00 MB	144.00 MB	152.00 MB	160.00 MB	168.00 MB	176.00 MB	192.00 MB	280.00 MB	312.00 MB	472.00 MB	568.00 MB	736.00 MB
rpc_speed(GB/s)	1.04	1.51	1.77	1.93	2.00	2.12	2.08	2.10	2.20	2.19	2.32	2.36	2.34	2.25	2.48	2.46	2.45	2.50	2.43	2.42	2.38	2.37	2.27	2.52	2.67	3.06	3.24	3.43

migration_size	8.00 MB	16.00 MB	24.00 MB	32.00 MB	40.00 MB	48.00 MB	56.00 MB	64.00 MB	72.00 MB	80.00 MB	88.00 MB	96.00 MB	104.00 MB	112.00 MB	120.00 MB	128.00 MB	136.00 MB	144.00 MB	152.00 MB	160.00 MB	168.00 MB	176.00 MB	312.00 MB	536.00 MB	544.00 MB	552.00 MB	560.00 MB	576.00 MB	584.00 MB	688.00 MB
gloo_speed(GB/s)	0.98	1.62	1.85	2.26	2.48	2.60	2.72	2.91	2.71	2.79	3.10	3.02	2.71	3.10	3.56	2.80	3.08	2.73	2.66	2.35	2.65	2.62	2.43	2.53	2.70	2.94	2.32	2.55	2.79	2.42

migration_size	8.00 MB	16.00 MB	24.00 MB	32.00 MB	40.00 MB	48.00 MB	56.00 MB	64.00 MB	72.00 MB	80.00 MB	88.00 MB	96.00 MB	104.00 MB	112.00 MB	120.00 MB	128.00 MB	136.00 MB	152.00 MB	160.00 MB	176.00 MB	184.00 MB	192.00 MB	312.00 MB	320.00 MB	480.00 MB
nccl_speed(GB/s)	0.20	0.48	0.66	0.80	1.05	1.26	1.29	1.52	1.67	1.68	1.56	1.54	2.14	1.93	2.22	2.58	3.02	3.32	3.38	3.67	0.59	3.71	3.82	5.08	7.13