fix(environment): add setter for editSessionId

[SpencerJung]

Related Issue

Closes #316633

Summary

The editSessionId property was defined as a getter only in both native and browser environment services. Code in editSessions.contribution.ts was assigning to it (to clear the ID after resume), causing "Cannot set property editSessionId which has only a getter" errors.

Changes

• Add setter to AbstractNativeEnvironmentService (native)
• Add setter to BrowserEnvironmentService with private backing field (web)

Verification Evidence

• npm run compile-check-ts-native: PASSED (no TypeScript errors)

Checklist

• Base branch is main
• No unauthorized version bump
• All feasible verification checks attempted
• No unintended schema or lockfile changes

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds runtime mutability for editSessionId in environment services so the value can be updated after initialization (e.g., after an edit session is established).

Changes:

• Add a setter to editSessionId in the browser workbench environment service using a private override field.
• Add a setter to editSessionId in the native environment service by writing back into parsed args.

Reviewed changes

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

File	Description
src/vs/workbench/services/environment/browser/environmentService.ts	Introduces a mutable editSessionId via private backing field + setter.
src/vs/platform/environment/common/environmentService.ts	Makes editSessionId writable by updating args['editSessionId'].

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