Modify CodeAgent to exclude certain tools by default

[codegen-team]

This PR modifies the CodeAgent class to exclude the reveal_symbol and move_symbol tools by default. These tools will not be included unless explicitly provided in the tools argument during initialization.

Changes Made:

• Updated the __init__ method in CodeAgent to filter out reveal_symbol and move_symbol from the default tools list.

This change ensures that these tools are not used unless specifically requested, aligning with the user's requirements.

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