Pause automatic inline completions on metered connections

[Dmitriy Vasyura (dmitrivMS)]

• add proposed meteredNetworkAware inline-completion provider metadata, defaulting to false; providers opt in when they are local-only or handle metered connections themselves
• filter automatic providers that are not metered-network aware before applying provider-group exclusions, and recompute eligibility after debounce immediately before provider dispatch
• preserve metered-network-aware providers, explicit user-triggered requests, and requests already in flight when the connection becomes metered
• refresh active automatic sessions when providers become available without activating stopped sessions or cancelling matching explicit work
• ignore content-change signals from providers that are unavailable for automatic requests
• mark the built-in local-only Emmet provider as metered-network aware; keep network-capable Copilot providers on the safe default
• add regression coverage for provider selection, debounce transitions, inactive sessions, explicit request reuse, cache invalidation, and request lifetime behavior

Fixes #297407
Fixes #297412

[Copilot]

Pull request overview

Pauses automatic network-backed inline completions on metered connections while preserving explicit and in-flight requests.

Changes:

• Adds provider network-usage metadata and RPC propagation.
• Gates automatic network-backed provider calls.
• Adds coverage for metered-connection behavior.

Show a summary per file

File	Description
src/vscode-dts/vscode.proposed.inlineCompletionsAdditions.d.ts	Adds network-usage metadata.
src/vs/workbench/api/common/extHostLanguageFeatures.ts	Sends metadata through RPC.
src/vs/workbench/api/common/extHost.protocol.ts	Extends the RPC contract.
src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts	Applies the metered-connection gate.
src/vs/workbench/api/test/browser/extHostLanguageFeatures.test.ts	Tests gating and preserved requests.

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• Files reviewed: 4/5 changed files
• Comments generated: 1
• Review effort level: Balanced

[Copilot]

Review details

• Files reviewed: 12/13 changed files
• Comments generated: 2
• Review effort level: Balanced

[Copilot]

Review details

• Files reviewed: 11/12 changed files
• Comments generated: 0 new
• Review effort level: Balanced

[Copilot]

Review details

• Files reviewed: 11/12 changed files
• Comments generated: 0 new
• Review effort level: Balanced