fix: JupyterCodeExecutor temp directory leak (#7217)

[paipeline]

Summary

Fixes #7217 — JupyterCodeExecutor leaks temporary directories because it uses tempfile.mkdtemp() without ever cleaning up the created directory.

Problem

When no explicit output_dir is provided, JupyterCodeExecutor.__init__ calls tempfile.mkdtemp() to create a temporary directory. However, this directory is never removed — not on garbage collection, not on stop(), and not on interpreter shutdown. Over time (especially in long-running agent loops), this leaks directories in the system temp folder.

Fix

• Replaced tempfile.mkdtemp() with tempfile.TemporaryDirectory(), storing the object so it can be explicitly cleaned up.
• Added cleanup logic in the stop() method to call .cleanup() on the temporary directory.
• When the user provides their own output_dir, behavior is unchanged (we never delete user-supplied directories).

Testing

Existing tests continue to pass. The fix is minimal and scoped to resource cleanup only.

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