[WIP] Refactor diagnosis manager

[samplise]

What changes were proposed in this pull request?

Refactor diagnosis manager.

Why are the changes needed?

Complete the diagnose manager implmenetation.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Unit test

[BalaBalaYi]

Need annotations.

[BalaBalaYi]

Change module name to job_context.py.

[BalaBalaYi]

This method should not exist or not be public.

[codecov]

Codecov Report

Attention: Patch coverage is 87.41935% with 117 lines in your changes missing coverage. Please review.

Project coverage is 80.57%. Comparing base (186783e) to head (43dce77).

Files with missing lines	Patch %	Lines
...lrover/python/diagnosis/common/diagnosis_action.py	53.24%	36 Missing ⚠️
dlrover/python/elastic_agent/torch/training.py	46.87%	17 Missing ⚠️
dlrover/python/master/node/dist_job_manager.py	79.72%	15 Missing ⚠️
dlrover/python/master/node/worker.py	63.15%	14 Missing ⚠️
dlrover/python/master/node/training_node.py	81.57%	7 Missing ⚠️
...rover/python/master/diagnosis/diagnosis_manager.py	85.18%	4 Missing ⚠️
dlrover/python/master/node/local_job_manager.py	84.61%	4 Missing ⚠️
dlrover/python/master/node/ps.py	84.61%	4 Missing ⚠️
...rover/python/elastic_agent/config/launch_config.py	93.87%	3 Missing ⚠️
.../python/elastic_agent/diagnosis/diagnosis_agent.py	92.30%	3 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1302      +/-   ##
==========================================
+ Coverage   80.52%   80.57%   +0.05%     
==========================================
  Files         222      226       +4     
  Lines       20707    21266     +559     
==========================================
+ Hits        16674    17136     +462     
- Misses       4033     4130      +97     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.