Document the minimum required version for Copilot

[aponcedeleonch]

We don't seem to have documented the supported Copilot version.

Today @peppescg and me experienced issues on Copilot 1.250.0. We couldn't connect to CodeGate. We know that CodeGate runs on Copilot 1.257.0, (it's what I am currently using).

Logs seen in vscode with version Copilot 1.250.0

2025-01-21 14:19:15.930 [error] [default] Error sending telemetry FetchError: tunneling socket could not be established, cause=socket hang up
    at fetch (/Users/giuseppe/.vscode/extensions/github.copilot-1.250.0/node_modules/@adobe/helix-fetch/src/fetch/index.js:99:11)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at cachingFetch (/Users/giuseppe/.vscode/extensions/github.copilot-1.250.0/node_modules/@adobe/helix-fetch/src/fetch/index.js:288:16)
    at zue.fetch (/Users/giuseppe/.vscode/extensions/github.copilot-1.250.0/lib/src/network/helix.ts:93:22) {
  type: 'system',
  _name: 'FetchError',
  code: 'ECONNRESET',
  errno: undefined,
  erroredSysCall: undefined,

[danbarr]

Hmm, I know I've upgraded Copilot through several versions now...I just rolled back my extension to 1.250.0, reloaded VS Code, and CodeGate is still working for me. Same going back to 1.240.

[aponcedeleonch]

uuhm then maybe it was the vscode version. We updated both but I assumed that the culprit was Copilot
I will put it in the issue.

Current vscode version: 1.96.2
Potential version with the issue: 1.81.x