refactor: separate core dependencies from misc install scripts

[shunk031]

Summary

• separate core dependency installation from misc utilities on macOS
• add dedicated pre-install chezmoi hooks for macOS/Ubuntu dependency scripts
• rename Ubuntu common installer to dependencies.sh and add git to required packages

Notes

• this PR includes only files that were already staged when requested

[shunk031]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'MacOS benchmark'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.

Benchmark suite	Current: a506b9e	Previous: 75ed9c8	Ratio
zsh initial startup time	22.8 Second	10.62 Second	2.15

This comment was automatically generated by workflow using github-action-benchmark.

CC: @shunk031

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.40%. Comparing base (300e2a7) to head (e855fa1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #381   +/-   ##
=======================================
  Coverage   74.40%   74.40%           
=======================================
  Files           6        6           
  Lines         125      125           
=======================================
  Hits           93       93           
  Misses         32       32           

Flag	Coverage Δ
ubuntu-latest-client	74.40% <ø> (ø)
ubuntu-latest-server	74.40% <ø> (ø)

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