Stop execution if tool version already installed

[TinaMor]

PR description

Background information

When the version of a tool is already installed, the Install-Command uninstalls then reinstalls the tool. To fix this, if the tool version is already installed, the script will stop execution and show the user a warning. If a user must reinstall it, they can pass -Force flag when running the command.

Github issue

#20

Testing information

Check installed buildkit version

> Show-ContainerTools -Latest | Where-Object {$_.Tool -eq 'buildkit'} | Format-List

For unregistered services/daemons, check the tool's help or register the service using
        Register-BuildkitdService, Register-ContainerdService, Start-BuildkitdService, Start-ContainerdService, Stop-BuildkitdService, Stop-ContainerdService

Tool          : buildkit
Installed     : True
Version       : v0.19.0
Daemon        : buildkitd
DaemonStatus  : Stopped
LatestVersion : v0.19.0

Try to install an already installed version

Should show user a warning and stop installation

> Install-Buildkit -Version v0.19.0

Confirm
Are you sure you want to perform this action?
Performing the operation "Buildkit will be uninstalled from and reinstalled at C:\Program Files\Buildkit" on target "COMPUTERNAME".
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [S] Suspend  [?] Help (default is "Y"): Y
WARNING: Buildkit already exists at C:\Program Files\Buildkit or the directory is not empty
WARNING: Installed Buildkit version is the same as the requested version. Please uninstall the existing version using 'Uninstall-Containerd' or use -Force to reinstall.

Force install an already installed version

Should show use a warning, proceed to uninstall the installed version, then re-install the version

> Install-Buildkit -Version v0.19.0 -Force

Confirm
Are you sure you want to perform this action?
Performing the operation "Buildkit will be uninstalled from and reinstalled at C:\Program Files\Buildkit" on target "COMPUTERNAME".
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [S] Suspend  [?] Help (default is "Y"): Y
WARNING: Buildkit already exists at C:\Program Files\Buildkit or the directory is not empty
WARNING: Installed Buildkit version is the same as the requested version. Please uninstall the existing version using 'Uninstall-Containerd' or use -Force to reinstall.
WARNING: Uninstalling preinstalled Buildkit at the path C:\Program Files\Buildkit
Downloading and installing Buildkit v0.19.0 at C:\Program Files\Buildkit
Extracting Buildkit to C:\Program Files\Buildkit
Cleanup to remove downloaded files
Successfully installed Buildkit v0.19.0 at C:\Program Files\Buildkit

Other useful Buildkit commands: Get-BuildkitLatestVersion, Register-BuildkitdService, Start-BuildkitdService, Stop-BuildkitdService, Uninstall-Buildkit.
To learn more about each command, run Get-Help <command-name>, e.g., 'Get-Help "*buildkit*"' or 'Get-Help Register-BuildkitdService'

For buildctl usage: run "buildctl.exe -h"

Checklist

As part of our commitment to engineering excellence, before submitting this PR, please make sure:

• You've tested this code in both Desktop & Server environments and AMD & ARM64 enviroments (functional testing).
• You've added unit tests for new code.
• You've added/updated documentation in the cmdlet docs, command-reference.md and the modules help files.
• You've reviewed the PR/code best practices defined in the CONTRIBUTING.md.

In addition, after this PR has been reviewed, please agree to:

• If changes have been made to your PR in the process of addressing comments, please make sure to test again the final version in both AMD and ARM64 environments.
• Validate your changes have not introduced any regressions.

[iankingori]

Messaging is inconsistent, Uninstall-Containerd in buildkit warning

[iankingori]

containerd, nerdctl and buildkit version checks look similar, perhaps break this logic out into utilities