SSH action proxy jump

[boddissattva]

Describe the changes you've made

• Add proxy setup in SSH client action.
• Add associated acceptance test.with containers.

Checklist

• Refer to issue(s) the PR solves
• New java code is covered by tests
• Add screenshots or gifs of the new behavior, if applicable.
• All new and existing tests pass
• No git conflict

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.07143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 61.26%. Comparing base (941ea6e) to head (c00d2e2).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
...java/com/chutneytesting/action/ssh/Connection.java	72.72%	2 Missing and 1 partial ⚠️
...com/chutneytesting/action/ssh/sshj/SshJClient.java	95.12%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #219      +/-   ##
============================================
+ Coverage     60.88%   61.26%   +0.38%     
- Complexity     3341     3417      +76     
============================================
  Files           662      668       +6     
  Lines         18193    18478     +285     
  Branches       1000     1010      +10     
============================================
+ Hits          11076    11321     +245     
- Misses         6718     6743      +25     
- Partials        399      414      +15     

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