Add option to auto-delete temporary files in LocalCommandLineCodeExecutor (#6556)

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## Why are these changes needed?

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solves. -->

The `LocalCommandLineCodeExecutor `creates temporary files for each code
execution, which can accumulate over time and clutter the filesystem -
especially when a temporary working directory is not used. These changes
introduce an option to automatically delete temporary files after
execution, helping to prevent file system debris, reduce disk usage, and
ensure cleaner runtime environments in long-running or repeated
execution scenarios.

## Related issue number

Closes #4380

## Checks

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<https://microsoft.github.io/autogen/>. See
<https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to
build and test documentation locally.
- [x] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
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