fix parsing .editorconfig line endings, add a unit test #10736
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Fixes #10684
Context
editorconfig settings were ignored due to being incapable of parsing it if they had different line endings than the current system uses
Changes Made
use StreamReader instead of string.Split
Testing
unit test that file with multiple line endings is parsed correctly
Notes
This is the fix that should go to main, a simpler fix #10740 goes to servicing.