Make sdwebui tests pass (when SD is running)

[cwenner]

Background

Looking for what literal to put in IMAGE_PROVIDER, I found an inconsistent literal in a test, and made more changes to get the SD xfail tests to instead pass.

Changes

• Correct literal argument sd_webui to sdwebui in test_sd_webui.
• Make generated-image path check work in Windows as well.
• Change passing tests requiring SD to be running from xfail to pass.

Documentation

Explanations added for the tests to be skipped, replacing the explanations for xfail. No other documentation should be needed as the changes are small and just fix tests.

Test Plan

• With SD running, uncommented pytest.mark.skip and got successful runs for test_sd_webui and test_sd_webui_negative_prompt.

I have not tested this change on other OS:es but all paths that previously worked should still work (split(":") -> split(":",1))

PR Quality Checklist

• [X] My pull request is atomic and focuses on a single change.
• [ ] I have thoroughly tested my changes with multiple different prompts.
• [X] I have considered potential risks and mitigations for my changes.
• [X] I have documented my changes clearly and comprehensively.
• [X] I have not snuck in any "extra" small tweaks changes

Tests have been made to work. No new tests need to be added to test that the tests work.

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Codecov Report

Patch coverage has no change and project coverage change: -0.13 :warning:

Comparison is base (900de5f) 60.96% compared to head (99239b5) 60.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3721      +/-   ##
==========================================
- Coverage   60.96%   60.84%   -0.13%     
==========================================
  Files          73       73              
  Lines        3315     3315              
  Branches      543      543              
==========================================
- Hits         2021     2017       -4     
- Misses       1155     1160       +5     
+ Partials      139      138       -1     

see 1 file with indirect coverage changes

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