Intermittent infra issue with Mac pipeline during CMakeSourceGenerate - Agent Pool Validation step - Error: connect EHOSTDOWN

[ahsonkhan]

This is the first time I have observed this but logging it for tracking to drive reliability up.

From this PR #5389:
Leg CMakeSourceGenerate Mac, Step Agent Pool Validation
https://dev.azure.com/azure-sdk/public/_build/results?buildId=3545400&view=logs&j=0e8a4fef-2e3d-5eed-ec7c-86f1a97aad2d&t=ebc0fd51-899e-5574-68b4-71745560b0d4&l=9

##[error]Unhandled: connect EHOSTDOWN 169.254.169.254:80 - Local (10.212.9.38:49501)
##[error]Error: connect EHOSTDOWN 169.254.169.254:80 - Local (10.212.9.38:49501)
    at internalConnect (net.js:882:16)
    at defaultTriggerAsyncIdScope (internal/async_hooks.js:294:19)
    at defaultTriggerAsyncIdScope (net.js:972:9)
    at process._tickCallback (internal/process/next_tick.js:61:11)
    at Function.Module.runMain (internal/modules/cjs/loader.js:834:11)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
Finishing: Agent Pool Validation

cc @danieljurek, @RickWinter