fix(e2e):optimise e2e

[goldenxinxing]

Description

1. Replace mnist with simple example in e2e test
2. replace 'run_demo.sh' with python script
3. Print the task log regardless of success or failure
4. fix some tiny bug

• get_data_loader(): end+1 -> end
• PipeHandler repeat record ppl/cmp's status
• add flush option for ppl（an optional that default to false for use in some single-thread unit test without atexit）

Modules

• UI
• Controller
• Agent
• Client
• Python-SDK
• Others

Checklist

• run code format and lint check
• add unit test
• add necessary doc

[codecov]

Codecov Report

Merging #1320 (92f040a) into main (71d6704) will increase coverage by 5.76%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1320      +/-   ##
============================================
+ Coverage     79.98%   85.75%   +5.76%     
============================================
  Files           294       64     -230     
  Lines         13903     7275    -6628     
  Branches        696        0     -696     
============================================
- Hits          11121     6239    -4882     
+ Misses         2510     1036    -1474     
+ Partials        272        0     -272     

Flag	Coverage Δ
controller	?
standalone	85.75% <100.00%> (+0.02%)	⬆️
unittests	85.75% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
client/starwhale/api/_impl/dataset/loader.py	100.00% <ø> (ø)
client/starwhale/api/_impl/data_store.py	93.44% <100.00%> (+<0.01%)	⬆️
client/starwhale/api/_impl/model.py	89.92% <100.00%> (+0.22%)	⬆️
...e/mlops/configuration/security/JwtLoginFilter.java
...hale/mlops/domain/bundle/revert/RevertManager.java
...arwhale/mlops/domain/project/ProjectConvertor.java
...i/starwhale/mlops/domain/system/SystemVersion.java
...hale/mlops/domain/system/agent/AgentConverter.java
...e/mlops/domain/evaluation/ViewConfigConvertor.java
...va/ai/starwhale/mlops/domain/task/TaskService.java
... and 224 more

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[anda-ren]

lgtm