test demo on helm

[siyuan0322]

What do these changes do?

Related issue number

Fixes #2172

[codecov-commenter]

Codecov Report

Merging #2412 (100f1ee) into main (0491d27) will decrease coverage by 32.51%.
The diff coverage is 4.34%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2412       +/-   ##
===========================================
- Coverage   72.43%   39.93%   -32.51%     
===========================================
  Files          88       88               
  Lines        9760     9771       +11     
===========================================
- Hits         7070     3902     -3168     
- Misses       2690     5869     +3179     

Impacted Files	Coverage Δ
...on/graphscope/tests/kubernetes/test_demo_script.py	75.65% <4.34%> (-5.91%)	⬇️
...ython/graphscope/tests/unittest/test_cython_ast.py	0.00% <0.00%> (-100.00%)	⬇️
...ython/graphscope/tests/unittest/test_serailaize.py	0.00% <0.00%> (-100.00%)	⬇️
python/graphscope/analytical/udf/patch.py	3.47% <0.00%> (-96.53%)	⬇️
python/graphscope/tests/unittest/test_lazy.py	0.00% <0.00%> (-96.22%)	⬇️
python/graphscope/tests/unittest/test_app.py	0.00% <0.00%> (-96.18%)	⬇️
...thon/graphscope/tests/unittest/test_scalability.py	0.00% <0.00%> (-96.16%)	⬇️
...hon/graphscope/tests/unittest/test_create_graph.py	0.00% <0.00%> (-92.89%)	⬇️
python/graphscope/tests/unittest/test_graph.py	0.00% <0.00%> (-85.92%)	⬇️
python/graphscope/tests/unittest/test_context.py	0.00% <0.00%> (-81.36%)	⬇️
... and 37 more

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