fix: add encoding=utf-8 to file open calls in playwright_controller

[1Ckpwee]

Summary

Adds explicit encoding='utf-8' parameter to open() calls in autogen-ext that are missing it. On non-English Windows systems, Python defaults to the system encoding (e.g., cp1252, gbk), which causes UnicodeDecodeError when reading/writing files containing non-ASCII characters.

Files fixed:

• code_executors/docker_jupyter/_docker_jupyter.py — HTML file writing
• experimental/task_centric_memory/utils/page_logger.py — log/HTML file writing (3 calls)
• experimental/task_centric_memory/utils/chat_completion_client_recorder.py — JSON session file read/write (2 calls)

Note: The original playwright_controller.py fix was already merged via PR #6094. This PR addresses the remaining open() calls in the same package that have the same issue.

Closes #5566

Test plan

• Verified all open() calls in the affected files now specify encoding
• No functional changes — only encoding parameter added

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