[fix-15907] Fix get remote shell exit code is incorrect

[Zzih96]

Purpose of the pull request

fix https://github.com/apache/dolphinscheduler/issues/15907

Brief change log

Verify this pull request

This pull request is code cleanup without any test coverage.

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This pull request is already covered by existing tests, such as (please describe tests).

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This change added tests and can be verified as follows:

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If your pull request contain incompatible change, you should also add it to docs/docs/en/guide/upgrede/incompatible.md

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 39.86%. Comparing base (ba5de75) to head (397a221).

:exclamation: Current head 397a221 differs from pull request most recent head 9879748. Consider uploading reports for the commit 9879748 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##                dev   #15911      +/-   ##
============================================
- Coverage     39.86%   39.86%   -0.01%     
+ Complexity     5060     5059       -1     
============================================
  Files          1369     1369              
  Lines         45635    45635              
  Branches       4869     4869              
============================================
- Hits          18193    18192       -1     
  Misses        25544    25544              
- Partials       1898     1899       +1     

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[stoplyy]

It seems a new bug has been introduced.

The .trim() in the original code is necessary, otherwise the case of xxx-0\n cannot be handled.