[SW #1088]: Much better handling of highlighted search excerpts:
[SW #1088]: Much better handling of highlighted search excerpts:

- Once sw_views_pre_render_sw_search() has the clean excerpt ([SW
  #1024]) it stashes the value into the $node object for each result.
- When we render the entity with the 'search_result' view mode, we can
  find this stashed excerpt value in the same object, and use that to
  populate the separate search_excerpt twig variable.
- The "teaser" is totally unmodified, massively simplifying the code.
- Also consolidates handling of "story label" for legacy blogs.
- Consistently do our own smart HTML stripping of any content in a
  search_result, since the twig template makes the entire area a link.

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