tests: add ssh proxy testcases

[9547]

What problem does this PR solve?

Add more ssh-proxy-based test cases.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.76%. Comparing base (b38df71) to head (61b90f8).
Report is 408 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1470       +/-   ##
===========================================
+ Coverage   15.80%   50.76%   +34.95%     
===========================================
  Files         149      290      +141     
  Lines       15023    26349    +11326     
===========================================
+ Hits         2375    13376    +11001     
+ Misses      12131    10962     -1169     
- Partials      517     2011     +1494     

Flag	Coverage Δ
cluster	43.86% <ø> (?)
dm	26.18% <ø> (?)
integrate	50.76% <ø> (+34.95%)	⬆️
playground	13.54% <ø> (?)
tiup	15.78% <ø> (-0.02%)	⬇️
unittest	∅ <ø> (∅)

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[ti-chi-bot]

@9547: PR needs rebase.

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