fix(auth): Apply static workspace ID for Eclipse Che instances (#7614)

## Problem
Eclipse Che-based workspaces on remote compute will change their
hostname if the backing compute changes, thus requiring a reauth.

## Solution
Swap to keying off the Che workspace ID, which should be static for
specific workspaces

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: bryceitoc9

packages/core/src/shared/vscode/env.ts

@@ -307,6 +307,15 @@ export async function getMachineId(): Promise<string> {
         // TODO: use `vscode.env.machineId` instead?
         return 'browser'
     }
+    // Eclipse Che-based envs (backing compute rotates, not classified as a web instance)
+    // TODO: use `vscode.env.machineId` instead?
+    if (process.env.CHE_WORKSPACE_ID) {
+        return process.env.CHE_WORKSPACE_ID
+    }
+    // RedHat Dev Workspaces (run some VSC web variant)
+    if (process.env.DEVWORKSPACE_ID) {
+        return process.env.DEVWORKSPACE_ID
+    }
     const proc = new ChildProcess('hostname', [], { collect: true, logging: 'no' })
     // TODO: check exit code.
     return (await proc.run()).stdout.trim() ?? 'unknown-host'