Force perceive certain areas when block changes

## Type of Issue

Select the type of issue:
- [ ] Bug report (to report a bug)
- [ ] Feature request (to request an additional feature)
- [ ] Tracker (I am just using this as a tracker)
- [ ] Refactor request
- [ ] Documentation Ask

## Description

When inst_seg is removed, we want to force the agent the perceive that area at next step.

I think it's already (or partially?) supported since `maybe_remove_inst_seg` is called only when a block changes, and when a [block changes](https://github.com/facebookresearch/droidlet/blob/main/craftassist/agent/low_level_perception.py#L147), this function [`maybe_remove_block_from_memory`](https://github.com/facebookresearch/droidlet/blob/main/craftassist/agent/low_level_perception.py#L235) will also be called inside which the surrounding area is added to `areas_to_perceive`.

Did I miss anything?