RDKEMW-19192: Implementation of handling PowerMode Change in NM plugin …

[Anand73-n]

…(#308)

Reason for change: Cherry-pick RDK-61298 to 8.4 support branch.
Test procedure: Change the PowerMode state and verify the behavior
Risks: low
Priority: P1

Signed-off-by: Anand N Anand_N@comcast.com

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[Copilot]

Pull request overview

This PR backports power-mode handling into the NetworkManager plugin so networking behavior (WiFi disconnect/reconnect, scan, DHCP lease reacquire) can be coordinated with Thunder PowerManager DeepSleep transitions, while also updating CI/test scaffolding to build without the full entservices-apis stack.

Changes:

• Introduces NetworkManagerPowerClient (Thunder IPowerManager COMRPC client) with a dedicated worker thread to process power events and send pre-change acks.
• Wires power-mode callbacks into NetworkManagerImplementation to disconnect/reconnect WiFi around DeepSleep, optionally deactivate Ethernet pre-sleep, and attempt post-wakeup scan/DHCP renew.
• Updates gnome/libnm implementation with Ethernet deactivation + DHCP “reacquire” via reapply, plus CI/workflow changes (PowerManager interface stub install, runner update, coverage tweaks).

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tests/mocks/thunder/IPowerManager.h	Adds a minimal IPowerManager stub for CI builds.
plugin/NetworkManagerPowerClient.h	Declares PowerManager client + callback interface and event threading model.
plugin/NetworkManagerPowerClient.cpp	Implements PowerManager connection, event sinks, queueing, ack/delay behavior.
plugin/NetworkManagerImplementation.h	Adds power callback inheritance, power client member, and new helpers.
plugin/NetworkManagerImplementation.cpp	Creates power client and implements DeepSleep pre-change/changed handling.
plugin/gnome/NetworkManagerGnomeWIFI.h	Adds Ethernet deactivate + DHCP reacquire APIs and new synchronization members.
plugin/gnome/NetworkManagerGnomeWIFI.cpp	Implements Ethernet deactivate and DHCP reacquire via applied-connection reapply; serializes ops.
plugin/gnome/NetworkManagerGnomeProxy.cpp	Exposes EthernetDeactivate / ReacquireDHCPLease via gnome proxy.
plugin/rdk/NetworkManagerRDKProxy.cpp	Adds no-op implementations for Ethernet deactivate / DHCP reacquire on RDK.
plugin/CMakeLists.txt	Links NetworkManagerPowerClient.cpp into the plugin library.
tests/l2Test/rdk/CMakeLists.txt	Adds power client compilation to RDK L2 test binary.
tests/l2Test/libnm/CMakeLists.txt	Adds power client compilation to libnm L2 test binary.
CMakeLists.txt	Adds ENABLE_ETHERNET_CONNECTION_HANDLING option/define.
.github/workflows/*	Installs the PowerManager stub header in CI; updates libnm runner to ubuntu-24.04; lcov flags tweak.

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