feat(konnect): react to gateway clients updates in NodeAgent #3727
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What this PR does / why we need it:
Currently
konnect.NodeAgent
runs a loop with a fixed nodes updates period. It makes propagating the changes in Gateways configuration take longer than it could. In this PR, we subscribe to the Gateway clients' changes to reactively update nodes in the Konnect when a change in discovered Gateways is detected.Additionally, it moves the
NodeAgent
's tests into a separate test package to make them black-box.Which issue this PR fixes:
Part of #3501.
PR Readiness Checklist:
Complete these before marking the PR as
ready to review
:CHANGELOG.md
release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR