[java] Close http connection for RemoteNode

[pujagani]

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Description

Related to ##13246

Motivation and Context

Ensuring all resources are closed when a node is removed from the GridModel.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (32edec1) 58.04% compared to head (042d63b) 58.04%.

❗ Current head 042d63b differs from pull request most recent head ea53cc7. Consider uploading reports for the commit ea53cc7 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #13313   +/-   ##
=======================================
  Coverage   58.04%   58.04%           
=======================================
  Files          88       88           
  Lines        5337     5337           
  Branches      224      224           
=======================================
  Hits         3098     3098           
  Misses       2015     2015           
  Partials      224      224           

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