Add shell package into general utils

[feiyu11859661]

Merge Checklist

All boxes should be checked before merging the PR

• [] The changes in the PR have been built and tested
• [] Ready to merge

Description

Any Newly Introduced Dependencies

How Has This Been Tested?

[Copilot]

Pull Request Overview

Adds a new internal shell utility package to resolve command binaries by full path, manage environment variables, and provide flexible command execution (with sudo, chroot, streaming, and input support).

• Defines a commandMap for absolute binary lookups and implements verifyCmdWithFullPath
• Provides helpers for fetching OS environments and proxy settings
• Adds GetFullCmdStr, ExecCmd, ExecCmdWithStream, and ExecCmdWithInput functions

Comments suppressed due to low confidence (2)

internal/utils/general/shell/shell.go:122

• Function name IsCommandExist suggests a boolean return, but it returns a string path. Consider renaming to GetCommandPath or changing the signature to return a bool.

func IsCommandExist(cmd string, chrootPath string) string {

internal/utils/general/shell/shell.go:1

• [nitpick] The new shell package lacks unit tests. Adding tests for key functions like GetFullCmdStr, ExecCmdWithStream, and verifyCmdWithFullPath would improve reliability.

package shell

[magerstam]

Overall looks nice and clean, just a suggestion on the hard coded map for commands.