Python: Upgrade github-copilot-sdk to v1.0.0b2 with new features (#5665)

* Upgrade github-copilot-sdk to v1.0.0b1 and implement new features

- Bump github-copilot-sdk dependency from 0.2.1 to 1.0.0b1
- Fix breaking type renames: ErrorClass -> ToolExecutionCompleteError,
  Result -> ToolExecutionCompleteResult
- Add instruction_directories support in GitHubCopilotOptions (session-level)
- Add copilot_home support in GitHubCopilotSettings (client-level)
- Add sample: github_copilot_with_instruction_directories.py
- Update README with new env var and sample entry
- Add 8 new unit tests covering the new features (103 total, 96% coverage)

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

* mypy fix

* small fix

* Address PR feedback: fix resume path, remove copilot_home from Options, bump to beta.2

- Forward runtime_options through _resume_session (fixes silent drop of
  instruction_directories/model/etc on resumed sessions)
- Remove copilot_home from GitHubCopilotOptions (client-level setting only
  consumed at startup, not per-call)
- Bump github-copilot-sdk from 1.0.0b1 to 1.0.0b2
- Add test for instruction_directories override on resumed sessions
- Update existing resume test to match new _resume_session signature

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

---------

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

python/packages/github_copilot/pyproject.toml

@@ -24,7 +24,7 @@ classifiers = [
 ]
 dependencies = [
     "agent-framework-core>=1.2.2,<2",
-    "github-copilot-sdk>=0.2.1,<=0.2.1; python_version >= '3.11'",
+    "github-copilot-sdk>=1.0.0b2,<=1.0.0b2; python_version >= '3.11'",
 ]
 
 [tool.uv]