[rust] Fix webview2 support

[bonigarcia]

Description

This PR fixes the support for WebView2, improving the mechanism for detecting the WebView2 version based on registry queries (see source), as suggested in #12958. Example:

selenium-manager --browser webview2 --debug
DEBUG   msedgedriver not found in PATH
DEBUG   webview2 detected at C:\Program Files (x86)\Microsoft\EdgeWebView\Application
DEBUG   Running command: REG QUERY HKLM\SOFTWARE\WOW6432Node\Microsoft\EdgeUpdate\Clients\{F3017226-FE2A-4295-8BDF-00C3A9A7E4C5} /v pv
DEBUG   Output: "\r\nHKEY_LOCAL_MACHINE\\SOFTWARE\\WOW6432Node\\Microsoft\\EdgeUpdate\\Clients\\{F3017226-FE2A-4295-8BDF-00C3A9A7E4C5}\r\n    pv    REG_SZ    118.0.2088.46\r\n"
DEBUG   Detected browser: webview2 118.0.2088.46
DEBUG   Required driver: msedgedriver 118.0.2088.46
DEBUG   msedgedriver 118.0.2088.46 already in the cache
INFO    Driver path: C:\Users\boni\.cache\selenium\msedgedriver\win64\118.0.2088.46\msedgedriver.exe
INFO    Browser path: C:\Program Files (x86)\Microsoft\EdgeWebView\Application\118.0.2088.46\msedge.exe

Motivation and Context

Fix for #12958.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.