Fix) Have builtin cd to handle spaces in folder name

[exxocism]

Project issue/Description

• Vibe coded to have builtin cd to handle spaces in folder name

  Fix shell word-splitting issues when working with directories containing spaces (e.g., Program Files)
  Quote all variable expansions in find_local_pkgset that may contain paths with spaces
  Fix cd function override to preserve argument boundaries using "$@" instead of unquoted $*
  

Major changes

• Have builtin cd to handle extra spaces: 78ca74b
• Have find_local_pkgset to handle extra spaces: 246b5a9

Minor changes

• None

Test env

• Open a new terminal or re-source your shell config
• Navigate to a directory with spaces in the name: cd "Program Files"
• Verify no "too many arguments" or syntax errors occur
• Verify GVM's auto-switching of Go versions still works when changing directories

[darkweaver87]

Confirming this bug on Debian (Linux 6.18, bash 5.x) with gvm installed via the official installer.

Even with single, double or backslash-escaped quotes, the unquoted $* inside the cd() override re-splits the path on whitespace before passing it to __gvm_oldcd.

Applied this PR's diff manually to scripts/env/cd and scripts/function/find_local_pkgset, re-sourced gvm, and cd into directories with spaces now works as expected. Go version auto-switching still works.

Thanks @exxocism 👍 for merge.