feat: ensure correct nodejs version is installed

[Yaminyam]

Fixes #2526

Summary

correct nodejs version

This PR addresses an issue where the script did not check if the currently installed Node.js version matches the required version.

If Node.js was already installed but with a different version, the script would not update it to the required version.

I have written logic to check if the Node version is exactly a specific version, not just above a certain version. Let me know if you find anything wrong with this!

---

pyenv enviornment check

The part of setting environment variables was refactored into a function and generalized for future reuse!
(add "config/fish/config.fish" for fish shell user too!)
I also eliminated the possibility of duplicating the script_content by using grep.

append_to_profiles() {
  script_content="$1"
  PROFILE_FILES=("zshrc" "bashrc" "profile" "bash_profile" "config/fish/config.fish")

  for PROFILE_FILE in "${PROFILE_FILES[@]}"; do
    FULL_PATH="${HOME}/.${PROFILE_FILE}"

    if [ -e "$FULL_PATH" ] && ! grep -qF "$script_content" "$FULL_PATH"; then
      echo "$script_content" >>"$FULL_PATH"
    fi
  done
}

and I considered a case where pyenv is installed but the environment variables are not set.

if ! type "pyenv" >/dev/null 2>&1 && [ ! -d "$HOME/.pyenv" ]; then

Checklist:

• Installer updates including:
  • New mandatory config options

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