Wait for agent loop to finish in automation (#262370)

* add `workbench.action.chat.open::waitForComplete`

* s/waitForCompletion/blockOnResponse

* cleanup tests

* remove unused comment

* Apply suggestion from @connor4312

Co-authored-by: Connor Peet <connor@peet.io>

* fixup tests

* don't block test loop on invokeTool

* Revert "don't block test loop on invokeTool"

This reverts commit d8d16dbe79.

* fix tool confirmation test

* attempt to account for the flip of isPendingConfirmation

* [DEBUG] debug CI flake

* register tool so it exists in all test envs

* finish configuring custom tool

* run test in seperate chat windows

* revert debug changes

* remove timeout dep

* fix assertion

* cleaup tests by examining output of command directly

---------

Co-authored-by: Connor Peet <connor@peet.io>

extensions/vscode-api-tests/package.json

@@ -87,6 +87,17 @@
         "commands": []
       }
     ],
+    "languageModelTools": [
+			{
+				"name": "requires_confirmation_tool",
+				"toolReferenceName": "requires_confirmation_tool",
+				"displayName": "Requires Confirmation Tool",
+				"modelDescription": "A noop tool to trigger confirmation.",
+				"canBeReferencedInPrompt": true,
+				"icon": "$(files)",
+				"inputSchema": {}
+			}
+    ],
     "configuration": {
       "type": "object",
       "title": "Test Config",