fix: Doc comment <code> block is not rendered correctly

[filzrev]

This PR intended to fix issue #10385

What's changed on this PR

1. Modify XmlComment::ResolveCode method.
   And add empty newline before <code> tag.
2. Add unit test code to XmlCommentUnitTest.cs
3. Modify related unit test code. (Add newline to expected string )

Other Changes

• Revert some changes of fix: Broken examples problems when using inheritdoc tag #9754.
  (It seems temporary workaround is not needed on latest docfx code)
• Add snapshot test for #9736 (and #9495/#9754)
• Update snapshot test results by manually running snapshot.yml workflow.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.35%. Comparing base (fe673ec) to head (8404524).
Report is 499 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10390      +/-   ##
==========================================
+ Coverage   74.31%   79.35%   +5.03%     
==========================================
  Files         536      547      +11     
  Lines       23189    23629     +440     
  Branches     4056     4062       +6     
==========================================
+ Hits        17234    18751    +1517     
+ Misses       4853     3709    -1144     
- Partials     1102     1169      +67     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.