[python] Remove Edge legacy options

[bwalderman]

Description

This change removes the use_chromium property from EdgeOptions, and removes a reference to the MicrosoftWebDriver (legacy) binary.

Motivation and Context

In #9166 the decision was made to remove EdgeHTML support from Selenium 4. Capabilities that were only applicable to MicrosoftWebDriver (EdgeHTML) can safely be removed. Now that Edge Chromium is the default and only supported Edge version, the use_chromium can be removed as well.

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.

[codecov-commenter]

Codecov Report

Merging #9908 (b1da433) into trunk (c096326) will decrease coverage by 0.09%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##            trunk    #9908      +/-   ##
==========================================
- Coverage   45.04%   44.94%   -0.10%     
==========================================
  Files          83       83              
  Lines        5543     5533      -10     
  Branches      251      253       +2     
==========================================
- Hits         2497     2487      -10     
+ Misses       2795     2793       -2     
- Partials      251      253       +2     

Impacted Files	Coverage Δ
py/selenium/webdriver/edge/webdriver.py	69.56% <ø> (ø)
py/selenium/webdriver/edge/options.py	52.63% <33.33%> (-16.34%)	⬇️

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