agents: bump @github/copilot to 1.0.38 (#313073)

* agents: bump @github/copilot to 1.0.38

Tracks the version pinned in extensions/copilot/package.json. Updates
both root and remote/ package.json + lockfiles. Verified by re-running
the real-SDK 'listModels returns well-shaped model entries' integration
test (AGENT_HOST_REAL_SDK=1).

(Written by Copilot)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: skip electron re-download when correct version already present

The macOS/Electron CI job was failing because `electron.ts` unconditionally
deletes `.build/electron` and re-downloads Electron on every invocation.

When integration tests run CSS/HTML tests via `node-electron.sh`, they call
`npm run electron` which triggers this re-download. This can fail due to
transient network errors (e.g. 502 Bad Gateway from GitHub), causing the
integration test step to fail even though Electron was already downloaded
successfully in the dedicated "Download Electron and Playwright" CI step.

Fix: add a `.version` marker file inside `.build/electron` that records the
Electron version, MS build ID, and architecture. On the next invocation,
`main()` reads this marker and returns early if it matches the expected
version, skipping the unnecessary delete-and-re-download cycle.

Agent-Logs-Url: https://github.com/microsoft/vscode/sessions/8d0b4207-2616-497e-9a4f-bf8a39671934

Co-authored-by: roblourens <323878+roblourens@users.noreply.github.com>

* Revert "fix: skip electron re-download when correct version already present"

This reverts commit e1811ece5bd0ad7ca4bb305f5c6b8d67c459c6df. That
commit was pushed to this PR by another agent and is unrelated to the
@github/copilot bump that this PR is for.

(Written by Copilot)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: roblourens <323878+roblourens@users.noreply.github.com>