fixed hauler completion commands

[zackbradys]

Please check below, if the PR fulfills these requirements:

• Commit(s) and code follow the repositories guidelines.
• Test(s) have been added or updated to support these change(s).
• Doc(s) have been added or updated to support these change(s).

Associated Links:

• [BUG] bash complete issues #301
• Updated cobra function for shell completion #304

Types of Changes:

• Bugfix on v1.1.0-rc.1

Proposed Changes:

• Removed the additional top-level command and added Root() to each completion generation function
• After testing and validating the initial release candidate of v1.1.0-rc.1, I noticed that the recent PR of Updated cobra function for shell completion #304 did fix the issues with the outputted autocompletion scripts, but introduce a bug by creating an additional top-level command of hauler hauler <shell>, instead of properly nesting completion under hauler with the fixed outputted autocompletion scripts.
• Hopefully the new Tests Workflow will let me/us catch this better...

zackbradys@Zacks-MBP Downloads % curl -sfL https://get.hauler.dev | sudo HAULER_VERSION=1.1.0-rc.1 bash
Password:

[INFO] Hauler: Starting Preflight Checks...

[INFO] Hauler: Starting Installation...
- Version: v1.1.0-rc.1
- Platform: darwin
- Architecture: arm64
- Install Directory: /Users/zackbradys/Downloads/

[INFO] Hauler: Starting Download...

[INFO] Hauler: Starting Checksum Verification...
- Expected Checksum: 5c6586b8bf52773cf3e76c737e10d777c948028965bcc80695612ffeadbba22e
- Determined Checksum: 5c6586b8bf52773cf3e76c737e10d777c948028965bcc80695612ffeadbba22e
- Successfully Verified Checksum: hauler_1.1.0-rc.1_darwin_arm64.tar.gz

[INFO] Hauler: Successfully Installed Hauler at /usr/local/bin/hauler

[INFO] Hauler: Hauler v1.1.0-rc.1 is now available for use!
- Documentation: https://hauler.dev

zackbradys@Zacks-MBP Downloads % hauler --help
Airgap Swiss Army Knife

Usage:
  hauler [flags]
  hauler [command]

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  hauler      Generates completion scripts for various shells
  help        Help about any command
  login       Log in to a registry
  store       Interact with hauler's embedded content store
  version     Print the current version

Flags:
  -h, --help               help for hauler
  -l, --log-level string    (default "info")

Use "hauler [command] --help" for more information about a command.

zackbradys@Zacks-MBP Downloads % hauler hauler --help
The completion sub-command generates completion scripts for various shells.

Usage:
  hauler hauler [command]

Available Commands:
  bash        Generates bash completion scripts
  fish        Generates fish completion scripts
  powershell  Generates powershell completion scripts
  zsh         Generates zsh completion scripts

Flags:
  -h, --help   help for hauler

Global Flags:
  -l, --log-level string    (default "info")

Use "hauler hauler [command] --help" for more information about a command.

Verification/Testing of Changes:

• View the PR Tests Workflow
• Clone the PR and run make build:

zackbradys@Zacks-MBP Downloads % ./dist/hauler_darwin_arm64/hauler --help
Airgap Swiss Army Knife

Usage:
  hauler [flags]
  hauler [command]

Available Commands:
  completion  Generate autocompletion scripts for various shells
  help        Help about any command
  login       Login to a registry
  store       Interact with the embedded content store
  version     Print the current version

Flags:
  -h, --help               help for hauler
  -l, --log-level string    (default "info")

Use "hauler [command] --help" for more information about a command.

zackbradys@Zacks-MBP Downloads % ./dist/hauler_darwin_arm64/hauler completion --help
Generate autocompletion scripts for various shells

Usage:
  hauler completion [command]

Available Commands:
  bash        Generates completion scripts for bash
  fish        Generates completion scripts for fish
  powershell  Generates completion scripts for powershell
  zsh         Generates completion scripts for zsh

Flags:
  -h, --help   help for completion

Global Flags:
  -l, --log-level string    (default "info")

Use "hauler completion [command] --help" for more information about a command.

Additional Context:

• N/A