Add timeout to SSH Agent streams

[droidmonkey]

• Fixes #11128

Testing strategy

Pending testing in a replicated environment

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[codecov[bot]]

Codecov Report

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

Project coverage is 63.76%. Comparing base (5d24495) to head (cd2b2da). Report is 19 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11290      +/-   ##
===========================================
- Coverage    63.78%   63.76%   -0.02%     
===========================================
  Files          362      362              
  Lines        38072    38070       -2     
===========================================
- Hits         24282    24273       -9     
- Misses       13790    13797       +7     

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[varjolintu]

I couldn't get the reproduce steps to work. If I make a custom systemd service everything works as expected, but without it the agent doesn't even run.

[droidmonkey]

Merging this since OP said it fixed their issue and there is no harm in having a defined timeout as 99% of the time the transaction is near instant.