engineering: Add launcher binary

[fintelia]

🔍 Description

This PR restores much of the old harpoon code to connect to Omaha servers, and implements a simple launcher binary that queries an Omaha server then connects to trident and does an update with the indicated COSI file

[Copilot]

Pull request overview

This PR reintroduces an Omaha (Nebraska) client flow by adding a new launcher binary/crate and wiring it into existing provisioning/update pathways so test images can download and (eventually) use it alongside Trident.

Changes:

• Added a new Rust workspace member crates/launcher implementing basic Omaha request/response handling and a CLI entrypoint.
• Integrated launcher into netlaunch RCP file injection and the test image systemd unit that downloads binaries.
• Updated build tooling to produce bin/launcher (via AZL3 Docker build) and copy launcher during Trident self-upgrade provisioning.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tools/pkg/netlaunch/netlaunch.go	Injects bin/launcher into the RCP-served files for test/provisioning flows.
tests/images/trident-mos/files/download-trident.service	Downloads /usr/bin/launcher alongside existing downloaded binaries.
Makefile	Builds launcher in build-azl3, installs to bin/launcher, and adds it to run-netlaunch prerequisites.
crates/trident/src/subsystems/management.rs	Copies /usr/bin/launcher into the target OS when SELF_UPGRADE_TRIDENT is enabled.
crates/launcher/src/omaha/xml.rs	Adds helper macro for deserializing nested “list” XML elements.
crates/launcher/src/omaha/status.rs	Defines Omaha status enums and helpers (+ unit tests).
crates/launcher/src/omaha/response.rs	Implements Omaha response parsing/validation (+ unit tests).
crates/launcher/src/omaha/request.rs	Implements Omaha request modeling and XML serialization (+ unit tests).
crates/launcher/src/omaha/mod.rs	Implements blocking Omaha request execution and event validation (+ unit tests).
crates/launcher/src/omaha/event.rs	Defines Omaha event payloads and acknowledgement parsing.
crates/launcher/src/omaha/app.rs	Adds AppVersion wrapper around semver::Version (+ unit tests).
crates/launcher/src/main.rs	Adds launcher CLI + Trident gRPC update trigger + query logic (+ unit tests).
crates/launcher/src/id.rs	Adds machine ID/hostname sourcing for Omaha identifiers.
crates/launcher/src/error.rs	Adds HarpoonError error model for launcher/Omaha operations.
crates/launcher/Cargo.toml	Defines the new launcher crate dependencies.
Cargo.toml	Adds crates/launcher to the workspace members.
Cargo.lock	Updates lockfile for the new crate/dependency graph.

[Copilot]

Pull request overview

Copilot reviewed 15 out of 16 changed files in this pull request and generated 5 comments.

[Copilot]

Pull request overview

Copilot reviewed 16 out of 17 changed files in this pull request and generated 5 comments.

[fintelia]

/AzurePipelines run [GITHUB]-trident-pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Copilot]

Pull request overview

Copilot reviewed 16 out of 17 changed files in this pull request and generated 2 comments.

[fintelia]

/AzurePipelines run [GITHUB]-trident-pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[fintelia]

/AzurePipelines run [GITHUB]-trident-pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Copilot]

Pull request overview

Copilot reviewed 18 out of 19 changed files in this pull request and generated 7 comments.