Remove the unused append-only arrow fragment.

[sighingnow]

What do these changes do?

The fragment is not unused anymore and we can stop maintianing it when we do some vineyard related refactors.

[codecov-commenter]

Codecov Report

Merging #1477 (f06e007) into main (daa8649) will decrease coverage by 6.56%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1477      +/-   ##
==========================================
- Coverage   73.60%   67.04%   -6.57%     
==========================================
  Files          88       88              
  Lines        9719     9719              
==========================================
- Hits         7154     6516     -638     
- Misses       2565     3203     +638     

Impacted Files	Coverage Δ
...aphscope/tests/kubernetes/test_resource_builder.py	0.00% <0.00%> (-100.00%)	⬇️
...on/graphscope/tests/kubernetes/test_demo_script.py	0.00% <0.00%> (-91.75%)	⬇️
python/graphscope/deploy/kubernetes/utils.py	11.90% <0.00%> (-58.58%)	⬇️
python/graphscope/deploy/kubernetes/cluster.py	23.55% <0.00%> (-50.20%)	⬇️
...thon/graphscope/tests/kubernetes/test_with_mars.py	0.00% <0.00%> (-44.83%)	⬇️
python/graphscope/interactive/query.py	41.12% <0.00%> (-38.71%)	⬇️
...n/graphscope/deploy/kubernetes/resource_builder.py	30.59% <0.00%> (-25.95%)	⬇️
python/graphscope/client/rpc.py	80.55% <0.00%> (-12.04%)	⬇️
python/graphscope/client/session.py	67.86% <0.00%> (-7.19%)	⬇️
python/graphscope/framework/dag_utils.py	57.46% <0.00%> (-6.04%)	⬇️
... and 3 more

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