refactor: remove BottomError

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Remove BottomError.

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.

Project coverage is 40.65%. Comparing base (0401f52) to head (328e27c).

Files	Patch %	Lines
src/app/process_killer.rs	0.00%	11 Missing ⚠️
src/data_collection/error.rs	0.00%	11 Missing ⚠️
src/app.rs	0.00%	2 Missing ⚠️
src/data_collection/processes.rs	0.00%	1 Missing ⚠️
src/data_collection/processes/unix/user_table.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1498      +/-   ##
==========================================
- Coverage   40.71%   40.65%   -0.06%     
==========================================
  Files         104      103       -1     
  Lines       17547    17549       +2     
==========================================
- Hits         7144     7135       -9     
- Misses      10403    10414      +11     

Flag	Coverage Δ
macos-12	35.99% <0.00%> (-0.01%)	⬇️
ubuntu-latest	42.60% <0.00%> (-0.06%)	⬇️
windows-2019	36.12% <0.00%> (-0.01%)	⬇️

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