Refactor kubedl_job_status implementation to log status changes for each job and add metric: kubedl_job_finished_time

[13241308289]

…ach job and add metric: kubedl_job_finished_time

Ⅰ. Describe what this PR does

1、Refactor kubedl_job_status implementation to log status changes for each job
2、Add metric: kubedl_job_finished_time

II. Does this pull request fix one issue?

fixes #309

III. Special notes for reviewers if any.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 30.88%. Comparing base (b93a2b4) to head (6a175de).

Files	Patch %	Lines
pkg/metrics/job_metrics.go	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #313      +/-   ##
==========================================
- Coverage   30.92%   30.88%   -0.04%     
==========================================
  Files         108      108              
  Lines        7024     7033       +9     
==========================================
  Hits         2172     2172              
- Misses       4556     4565       +9     
  Partials      296      296              

Flag	Coverage Δ
unittests	30.88% <0.00%> (-0.04%)	⬇️

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