[FlexiDag] remove some proxima-compatible codes

[simonjiao]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Other information

[github-actions]

Benchmark for 146b155

Click to view benchmark

Test	Base	PR	%
accumulator_append	1231.4±193.93µs	1320.5±158.12µs	+7.24%
block_apply/block_apply_10	513.1±42.50ms	595.8±23.16ms	+16.12%
block_apply/block_apply_1000	61.0±1.41s	60.8±3.57s	-0.33%
get_with_proof/db_store	95.5±0.99µs	72.5±12.81µs	-24.08%
get_with_proof/mem_store	60.4±7.80µs	54.6±6.26µs	-9.60%
put_and_commit/db_store/1	201.2±22.80µs	232.1±17.98µs	+15.36%
put_and_commit/db_store/10	1963.5±69.21µs	1851.7±116.56µs	-5.69%
put_and_commit/db_store/100	14.3±1.88ms	14.6±1.80ms	+2.10%
put_and_commit/db_store/5	894.8±90.85µs	868.7±101.66µs	-2.92%
put_and_commit/db_store/50	7.8±1.56ms	7.9±0.67ms	+1.28%
put_and_commit/mem_store/1	109.7±19.57µs	112.3±27.75µs	+2.37%
put_and_commit/mem_store/10	986.0±195.51µs	1079.4±131.46µs	+9.47%
put_and_commit/mem_store/100	10.3±1.58ms	9.7±1.61ms	-5.83%
put_and_commit/mem_store/5	477.2±75.70µs	583.2±66.36µs	+22.21%
put_and_commit/mem_store/50	5.1±0.78ms	6.8±0.04ms	+33.33%
query_block/query_block_in(10)_times(100)	6.6±0.55ms	6.6±0.98ms	0.00%
query_block/query_block_in(10)_times(1000)	66.8±7.74ms	66.3±7.05ms	-0.75%
query_block/query_block_in(10)_times(10000)	830.5±127.40ms	726.6±77.36ms	-12.51%
query_block/query_block_in(1000)_times(100)	1734.9±211.67µs	2.2±0.24ms	+26.81%
query_block/query_block_in(1000)_times(1000)	17.6±2.63ms	19.4±1.75ms	+10.23%
query_block/query_block_in(1000)_times(10000)	228.4±7.02ms	221.0±18.14ms	-3.24%
storage_transaction	1725.2±743.47µs	1400.1±481.00µs	-18.84%
vm/transaction_execution/1	549.6±65.65ms	662.4±35.05ms	+20.52%
vm/transaction_execution/10	188.9±14.10ms	186.7±12.28ms	-1.16%
vm/transaction_execution/20	173.9±8.67ms	162.1±11.50ms	-6.79%
vm/transaction_execution/5	247.4±28.44ms	223.9±16.13ms	-9.50%
vm/transaction_execution/50	204.6±14.09ms	203.1±8.76ms	-0.73%