build: declare product packaging manifest

[hdwhdw]

Summary

• Makefile defines one manifest for the nine sonic-gnmi product binaries.
• Native and cross builds create the nine declared binaries in build/bin.
• Debian package staging and make deinstall use this manifest.

Scope

This PR changes only Makefile. It does not change test fixtures, test privilege use, or cleanup behavior.

Verification

• A clean native build produced all nine binaries as user ID 1000 in the SONiC slave container.
• A clean build with CROSS_BUILD_ENVIRON=y produced the same nine binaries.
• After each build, make install staged all nine declared binaries in /usr/sbin.
• Install and deinstall checks passed with dialout enabled and disabled.
• git diff --check passed.

Azure DevOps task: 39500132

[azure-pipelines]

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[mssonicbld]

/azp run

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[Copilot]

Pull request overview

This PR refactors the build and install logic in the top-level Makefile to define a single “product binaries” manifest and to standardize both native and cross builds to emit the same set of artifacts into build/bin, aligning packaging/install staging with that manifest.

Changes:

• Switches build steps to consistently use go build -o $(BUILD_DIR)/... (instead of mixing go build vs go install) and ensures $(BUILD_DIR) exists.
• Introduces PRODUCT_BINARIES as a manifest of shipped executables and uses it to drive make install staging into /usr/sbin.
• Updates gNMI client build outputs to also land in build/bin for both native and cross builds.

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[mssonicbld]

/azp run

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

[hdwhdw]

Azure build 1209124 completed downstream validation of sonic-gnmi commit 892da4a for draft sonic-buildimage PR 29171.

• Eight platform and virtual-switch image jobs passed.
• The ARMHF job built the sonic-gnmi package, docker-sonic-gnmi, and the final installer. Unrelated strict software bill of materials (SBOM) validation then failed because syft does not support ARMHF.
• The T0, T0-2VLANs, T1-LAG, T1-LAG-VPP, multi-ASIC T1, and T2 Kernel-based Virtual Machine (KVM) jobs passed.
• Four other KVM jobs did not start because requests to the Elastictest scheduler timed out.

No downstream failure affected the sonic-gnmi package, image, or executed KVM paths. The sonic-buildimage PR remains a draft. Do not merge it.