Python: [BREAKING] Upgrade github-copilot-sdk to v1.0.0 (stable) (#6292)

* Python: Upgrade github-copilot-sdk to v1.0.0 (stable)

Upgrade agent-framework-github-copilot from github-copilot-sdk 1.0.0b2 to the
stable 1.0.0 release, adapting to all breaking API changes.

Source changes (_agent.py):
- SubprocessConfig removed: use RuntimeConnection.for_stdio(path=...) +
  CopilotClient kwargs (connection, log_level, base_directory)
- Import paths: copilot.generated.session_events -> copilot.session_events
- Settings: copilot_home -> base_directory (env GITHUB_COPILOT_BASE_DIRECTORY)
- Default deny handler: PermissionDecisionUserNotAvailable() (from
  copilot.generated.rpc)

Test changes:
- Updated imports and client-construction assertions (kwargs-based)
- Permission handler tests use concrete decision types
  (PermissionDecisionApproveOnce, PermissionDecisionDeniedInteractivelyByUser)

Sample changes:
- Permission handlers use PermissionHandler.approve_all or sync
  approve_and_log pattern (v1.0.0 protocol v3 dispatch is incompatible
  with blocking input() in permission handlers)
- Function approval sample uses asyncio.to_thread for interactive prompts
- Simplified imports across all samples

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address PR review: scope permission handlers, widen type, add test

- Shell sample: only approve kind='shell', deny others
- URL sample: only approve kind='url', deny others
- Use getattr() for kind-specific attributes to satisfy pyright
- Widen PermissionHandlerType to accept async handlers (matches SDK)
- Add test for _deny_all_permissions return value

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix validation script and strengthen test assertion

- Update scripts/sample_validation/create_dynamic_workflow_executor.py to
  use copilot.session_events imports and PermissionHandler.approve_all
- Assert isinstance(result, PermissionDecisionUserNotAvailable) instead of
  stringly-typed kind check

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add integration tests for GitHubCopilotAgent

Add 6 integration tests mirroring .NET coverage:
- Basic non-streaming response
- Streaming response
- Function tool invocation
- Session context (multi-turn)
- Session resume by ID
- Shell command execution

Tests require COPILOT_GITHUB_TOKEN env var (skipped otherwise).
Each test cleans up its Copilot session via delete_session.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/scripts/sample_validation/create_dynamic_workflow_executor.py

@@ -14,8 +14,8 @@ from agent_framework import (
     handler,
 )
 from agent_framework.github import GitHubCopilotAgent
-from copilot.generated.session_events import PermissionRequest
-from copilot.session import PermissionRequestResult
+from copilot.session import PermissionHandler, PermissionRequestResult
+from copilot.session_events import PermissionRequest
 from pydantic import BaseModel
 from sample_validation.const import WORKER_COMPLETED
 from sample_validation.discovery import DiscoveryResult
@@ -103,7 +103,7 @@ def prompt_permission(
     logger.debug(
         f"[Permission Request: {request.kind}] ({context})Automatically approved for sample validation."
     )
-    return PermissionRequestResult(kind="approved")
+    return PermissionHandler.approve_all(request, context)
 
 
 class CustomAgentExecutor(Executor):