fix: add handle for resolveExternalUri (#5624)

* fix: add handle for resolveExternalUri

This adds a fix to properly handle `resolveExternalUri` which is used by
extensions like Tabnine.

* fixup!: update patch

* fixup!: force update proxy patch

* fixup!: use proxyEndpointTemplate else manually add

* fixup!: throw error if productConfiguration missing

* feat(testing): add asExternalUri

This modifies the test extension used in e2e test by registering a new
command for testing `asExternalUri`.

* feat: add e2e test for asExternalUri

* docs: update playwright setup comments

* feat: add support for VSCODE_PROXY_URI

* chore: refresh patches

* feat: add test for VSCODE_PROXY_URI

* chore: add metadata to lang extension

* fixup!: fix part of service-worker patch

* fixup!: remove e2e test, update patch notes

* fixup!: refresh disable-downloads

* fixup!: formatting

test/e2e/extensions/test-extension/extension.ts

@@ -2,6 +2,7 @@ import * as vscode from "vscode"
 
 export function activate(context: vscode.ExtensionContext) {
   vscode.window.showInformationMessage("test extension loaded")
+  // Test extension
   context.subscriptions.push(
     vscode.commands.registerCommand("codeServerTest.proxyUri", () => {
       if (process.env.VSCODE_PROXY_URI) {
@@ -11,4 +12,20 @@ export function activate(context: vscode.ExtensionContext) {
       }
     }),
   )
+
+  // asExternalUri extension
+  context.subscriptions.push(
+    vscode.commands.registerCommand("codeServerTest.asExternalUri", async () => {
+      const input = await vscode.window.showInputBox({
+        prompt: "URL to pass through to asExternalUri",
+      })
+
+      if (input) {
+        const output = await vscode.env.asExternalUri(vscode.Uri.parse(input))
+        vscode.window.showInformationMessage(`input: ${input} output: ${output}`)
+      } else {
+        vscode.window.showErrorMessage(`Failed to run test case. No input provided.`)
+      }
+    }),
+  )
 }