Add infrastructure to enable 2-machine network testing on 1ES Azure pools.

[ProjectsByJackHe]

Description

This PR adds the scripts and workflow templates to enable 2 machine testing on 1ES pools.

Note: a lot of stuff can be re-factored and cleaned up for a better user experience. This should be done in a follow up PR, as this PR is already pretty massive.

The work done here follows:

Testing

See: https://github.com/microsoft/netperf/actions/runs/9586048711

Documentation

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.04%. Comparing base (f5bec53) to head (3565cf3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4364      +/-   ##
==========================================
- Coverage   85.36%   85.04%   -0.33%     
==========================================
  Files          56       56              
  Lines       15426    15426              
==========================================
- Hits        13169    13119      -50     
- Misses       2257     2307      +50     

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