[py] use Selenium Manager to locate drivers on PATH

[titusfortner]

Description

• No longer passing around the driver name
• Default executable string is None
• Calls DriverFinder to set path before starting service
• DriverFinder now only sets the path if it is None

Motivation and Context

Python implementation of #11356

[codecov-commenter]

Codecov Report

Patch coverage: 80.00% and project coverage change: -0.06 ⚠️

Comparison is base (3fbd0e5) 57.34% compared to head (364ef01) 57.28%.

❗ Current head 364ef01 differs from pull request most recent head 85ed311. Consider uploading reports for the commit 85ed311 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #12356      +/-   ##
==========================================
- Coverage   57.34%   57.28%   -0.06%     
==========================================
  Files          86       86              
  Lines        5352     5333      -19     
  Branches      193      193              
==========================================
- Hits         3069     3055      -14     
+ Misses       2090     2085       -5     
  Partials      193      193              

Impacted Files	Coverage Δ
py/selenium/webdriver/common/driver_finder.py	88.23% <50.00%> (-11.77%)	⬇️
py/selenium/webdriver/firefox/webdriver.py	64.47% <60.00%> (+0.83%)	⬆️
py/selenium/webdriver/safari/webdriver.py	50.00% <66.66%> (+2.63%)	⬆️
py/selenium/webdriver/ie/webdriver.py	86.95% <77.77%> (+2.34%)	⬆️
py/selenium/webdriver/edge/webdriver.py	82.35% <80.00%> (+2.35%)	⬆️
py/selenium/webdriver/chrome/service.py	78.94% <100.00%> (-6.06%)	⬇️
py/selenium/webdriver/chrome/webdriver.py	94.11% <100.00%> (-0.89%)	⬇️
py/selenium/webdriver/chromium/service.py	90.62% <100.00%> (+0.30%)	⬆️
py/selenium/webdriver/chromium/webdriver.py	46.15% <100.00%> (+1.05%)	⬆️
py/selenium/webdriver/common/service.py	88.52% <100.00%> (+0.09%)	⬆️
... and 4 more

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