feat(vscode): implement background job management with UI components and terminal integration

[zhanba]

Screenshot

Summary

• Add UI components for start, kill, and read background job operations
• Enhance command execution panel with background job support
• Improve terminal job management and output handling
• Add utility functions for background job lifecycle management
• Update environment prompts to include background job context
• Refactor tool call lifecycle to support background operations

Test plan

• run command in foreground, should remain same.
• run command in background
  • command start in background success
    • startBackgroundJob tool call success
    • terminal open and show
  • read background job output
    • readBackgroundJobOutput tool call success
      • should be able to read output since last read
      • should be able to read output with regex to filter output
      • should truncate output when output exceed limit
      • should be able to read output after command execution finished
      • should be able to read output after command execution aborted
      • should be able to read output after terminal closed
      • should contain execution status(running or finished) in output
      • should display error message if command execution failed
      • should read output failed when all output has been read and command execution finished
      • should read output failed when all output has been read and command execution aborted by user in terminal
  • kill background job
    • killBackgroundJob tool call success
      • should be able to kill command execution
      • should display error message if kill failed or execution already finished
• terminals in environment should contain backgroundJobId
• reopen task should display backgroundJob info properly
• share task should display backgroundJob info properly

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[zhanba]

storybook