Look for Selenium Manager in path defined by Environment Variable

[titusfortner]

Description

• each of the bindings look for SE_MANAGER_PATH environment variable for Selenium Manager first before looking in the standard location

Motivation and Context

• Allows users to override the bundled copy of Selenium Manager which could be useful for:
  • debugging with unreleased binary
  • using custom build on non-supported architecture
  • designating the location from a package manager (e.g., Conda)
  • putting in a directory with known permissions
• This is an alternate solution to [🚀 Feature]: Cache Selenium Manager #11359
  • Java is the only language that uses SM in a temp directory for each process and would benefit from a standard location; no good reason to move the binary for other languages
  • Using an environment variable is a more flexible solution for package managers (see conversation in fix for conda install of selenium-manager #12536)
  • The cached directory would change per Selenium release, where SM in a directory with environment variable won't need to be moved when Selenium is updated (useful for custom builds and package managers)
  • This code is much more straightforward and easier to maintain than [rb] copy selenium manager binary to cache and use from there #12547 & [java] Copy SM binary to cache folder and use it from there (#11359) #12539

[titusfortner]

I guess I should say, this doesn't *have to be an alternative. We could do both.

I think if we want to get 4.13 out soon, this one is sufficient for that need instead of waiting to implement #11359 in all the languages.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.03% ⚠️

Comparison is base (44ac51f) 56.53% compared to head (bca789f) 56.51%.
Report is 1 commits behind head on trunk.

❗ Current head bca789f differs from pull request most recent head 68c5eb2. Consider uploading reports for the commit 68c5eb2 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #12752      +/-   ##
==========================================
- Coverage   56.53%   56.51%   -0.03%     
==========================================
  Files          86       86              
  Lines        5253     5255       +2     
  Branches      187      187              
==========================================
  Hits         2970     2970              
- Misses       2096     2098       +2     
  Partials      187      187              

Files Changed	Coverage Δ
py/selenium/webdriver/common/selenium_manager.py	57.89% <100.00%> (-1.57%)	⬇️

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[titusfortner]

Hmm, but looks like I broke some tests. 😂

[titusfortner]

Hah, busted for not using Java 8 syntax. Hopefully last time that ever happens.

[titusfortner]

Ok, so I made a few important changes.

1. It expects the filename to be part of environment variable, not just the directory.
2. It defaults to using linux even if code doesn't know what it is; (this matches Java implementation)

[nvborisenko]

.net code reads env variable twice, can be improved.