[cherry-pick] Build with @github/copilot canary version

[vs-code-engineering]

Cherry-pick of #334649 from release/1.137.

Summary

• keep OSS builds on the public @github/copilot and @github/copilot-sdk versions
• keep product builds on the same SDK as OSS
• check in 1.0.84-canary.67.g6496fad.unsigned as the default product @github/copilot runtime version
• extend the existing authenticated Azure override to support runtime-only changes
• accept the runtime's policyHelper managed-settings diagnostics source

Implementation

The existing VSCODE_CLI_CANARY_VERSION parameter remains the product-build override mechanism, but its checked-in default is now the desired runtime canary. VSCODE_SDK_CANARY_VERSION stays none, so product builds retain the SDK from the OSS manifest. The shared pre-cache step now runs when either override is present and refreshes only the dependency that changed.

Validation

• cd build && npm run typecheck
• npm run typecheck-client
• npm run hygiene
• authenticated CLI-only override exercised in root and remote manifests using the prior published runtime canary
• read-only subagent review found no significant issues

The requested 1.0.84-canary.67.g6496fad.unsigned package is not yet visible on the private feed, so an Azure product build with that exact runtime cannot succeed until it is published.

Ported to release/1.137; main counterpart is #334648.

(Written by Copilot)

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

Ladislau Szomoru (@lszomoru)

Matched files:

• build/azure-pipelines/common/apply-sdk-canary-override.ts
• build/azure-pipelines/common/apply-sdk-canary.yml
• build/azure-pipelines/product-build-ado-ci.yml
• build/azure-pipelines/product-build.yml

[Copilot]

🟡 Changes recommended

The default runtime version is unpublished, causing default product and ADO CI builds to fail.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Updates product builds to use a canary Copilot runtime while retaining the OSS SDK version.

Changes:

• Enables runtime-only Copilot dependency overrides in Azure pipelines.
• Sets the product runtime default to a specific canary.
• Accepts policyHelper as a managed-settings diagnostics source.

File summaries

File	Description
build/azure-pipelines/product-build.yml	Sets the product runtime canary default.
build/azure-pipelines/product-build-ado-ci.yml	Mirrors the runtime default for ADO CI.
build/azure-pipelines/common/apply-sdk-canary.yml	Runs overrides for SDK or runtime changes.
build/azure-pipelines/common/apply-sdk-canary-override.ts	Supports independent runtime overrides.
src/vs/platform/agentHost/common/agent.ts	Extends the diagnostics source union.
src/vs/platform/agentHost/test/node/e2e/suites/managementExtensionsSuite.ts	Accepts the new diagnostics source in E2E validation.

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 0
• Review effort level: Balanced

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