Update mode_handlers snapshot to canonical exit_plan_mode action order

The E2E tests were updated to expect the canonical action order
[autopilot, interactive, exit_only], but the replay snapshot still
supplied [interactive, autopilot, exit_only] as the model's
exit_plan_mode tool-call arguments, which the CLI forwards verbatim to
the SDK handler. Align the snapshot with the tests so request.actions
matches across all language SDKs.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 446b10a1-29f6-4155-bf3a-ac1241c742f3

Author: stephentoub

test/snapshots/mode_handlers/should_invoke_exit_plan_mode_handler_when_model_uses_tool.yaml

@@ -13,7 +13,7 @@ conversations:
             function:
               name: exit_plan_mode
               arguments: '{"summary":"Greeting file implementation
-                plan","actions":["interactive","autopilot","exit_only"],"recommendedAction":"interactive"}'
+                plan","actions":["autopilot","interactive","exit_only"],"recommendedAction":"interactive"}'
       - role: tool
         tool_call_id: toolcall_0
         content: >-