py: Modifies install_addon method to support installing unpacked addons

[gpt14]

Description

Modifies install_addon method to support installing unpacked addons

Motivation and Context

implements #10265

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 #10308 (53c7508) into trunk (d17db9d) will increase coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##            trunk   #10308      +/-   ##
==========================================
+ Coverage   44.97%   44.99%   +0.02%     
==========================================
  Files          85       85              
  Lines        5479     5489      +10     
  Branches      269      269              
==========================================
+ Hits         2464     2470       +6     
- Misses       2746     2750       +4     
  Partials      269      269              

Impacted Files	Coverage Δ
py/selenium/webdriver/firefox/webdriver.py	32.63% <50.00%> (+2.04%)	⬆️

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[gpt14]

@titusfortner - please review

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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