chore: remove heap_bottom since it's unused

[AsakuraMizu]

No description provided.

[Copilot]

Pull request overview

This PR attempts to remove the unused heap_bottom field from the ProcessData struct along with its associated getter and setter methods. However, the PR is incomplete as it doesn't remove all usages of these methods in the codebase.

Key changes:

• Removed heap_bottom field from ProcessData struct in core/src/task.rs
• Removed get_heap_bottom() and set_heap_bottom() methods from ProcessData
• Removed one call to set_heap_bottom() in api/src/syscall/task/execve.rs

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
core/src/task.rs	Removes the heap_bottom field, its initialization, and associated getter/setter methods from the ProcessData struct
api/src/syscall/task/execve.rs	Removes the call to set_heap_bottom() when resetting the heap during execve

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