Change ssh heartbeat type to IGNORE

[ruanwenjun]

Purpose of the pull request

related issue

• [Bug] [Worker] RemoteShell tasks may have memory leak issue #15851
• The continuous increase of workerserver processes, is this normal? #15812

Brief change log

Verify this pull request

This pull request is code cleanup without any test coverage.

(or)

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

(or)

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

[SbloodyS]

LGTM.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 39.56%. Comparing base (ead5453) to head (c8fcfbb).

❗ Current head c8fcfbb differs from pull request most recent head 4386a44. Consider uploading reports for the commit 4386a44 to get more accurate results

Files	Patch %	Lines
...lphinscheduler/plugin/datasource/ssh/SSHUtils.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev   #15858      +/-   ##
============================================
+ Coverage     39.49%   39.56%   +0.07%     
- Complexity     4989     5014      +25     
============================================
  Files          1347     1347              
  Lines         45629    45629              
  Branches       4890     4889       -1     
============================================
+ Hits          18023    18055      +32     
+ Misses        25682    25648      -34     
- Partials       1924     1926       +2     

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