[ci] Fix Appium provisioning when no global npm exists

[rmarinho]

Description of Change

This pull request updates the Appium provisioning logic in Provisioning.csproj to handle errors more gracefully when checking the installed Appium version. The most important changes include adding error detection for the npm list output and ensuring a fallback mechanism to force installation if an error is detected.

When no global file is found it was throwing a error like so :

PS C:\repos\dotnet\maui> npm list -g appium --json --depth 1 --loglevel error
npm error code ENOENT
npm error syscall lstat
npm error path Q:\.tools\.npm-global
npm error errno -4058
npm error enoent ENOENT: no such file or directory, lstat 'Q:\.tools\.npm-global'
npm error enoent This is related to npm not being able to find a file.
npm error enoent
{
  "error": {
    "code": "ENOENT",
    "summary": "ENOENT: no such file or directory, lstat 'Q:\\.tools\\.npm-global'",
    "detail": "This is related to npm not being able to find a file."
  }
}
npm error A complete log of this run can be found in: Q:\.tools\.npm\_logs\2025-05-21T11_45_26_019Z-debug-0.log

Error handling improvements:

• Added a new property _AppiumNpmListHasError to detect if the npm list output contains an error. This property is set to True when an error is found. ([src/Provisioning/Provisioning.csprojL168-R182](https://github.com/dotnet/maui/pull/29607/files#diff-7b9d0c8e6acc03936bbba9421e02c53277575ad074bee658e94b87b4011f8c66L168-R182))
• Modified the JsonPeek task to conditionally extract the Appium version only if no error is detected in the npm list output. ([src/Provisioning/Provisioning.csprojL168-R182](https://github.com/dotnet/maui/pull/29607/files#diff-7b9d0c8e6acc03936bbba9421e02c53277575ad074bee658e94b87b4011f8c66L168-R182))
• Introduced a fallback mechanism to set _AppiumNpmListVersion to an empty value when an error is detected, ensuring that Appium will be reinstalled. ([src/Provisioning/Provisioning.csprojL168-R182](https://github.com/dotnet/maui/pull/29607/files#diff-7b9d0c8e6acc03936bbba9421e02c53277575ad074bee658e94b87b4011f8c66L168-R182))

Issues Fixed

Provisioning appium on new windows machine

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