feat: support VSCodium in the step VSCode

[SteveLauC]

Standards checklist:

• The PR title is descriptive.
• I have read CONTRIBUTING.md
• The code compiles (cargo build)
• The code passes rustfmt (cargo fmt)
• The code passes clippy (cargo clippy)
• The code passes tests (cargo test)
• Optional: I have tested the code myself

For new steps

• Optional: Topgrade skips this step where needed
• Optional: The --dry-run option works with this step
• Optional: The --yes option works with this step if it is supported by
  the underlying command

If you developed a feature or a bug fix for someone else and you do not have the
means to test it, please tag this person here.

Closes #787

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 6.84%. Comparing base (767f0d9) to head (a0d1ba2).

Files	Patch %	Lines
src/steps/generic.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #788      +/-   ##
========================================
- Coverage   6.91%   6.84%   -0.08%     
========================================
  Files         37      37              
  Lines      11645   11769     +124     
========================================
  Hits         805     805              
- Misses     10840   10964     +124     

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