Add a test for trailing blank lines after paragraphs.

The behavior in emacs does not match the description in the org-mode documentation. I have sent an email to the org-mode mailing list and I am waiting their response so I can adjust (or not adjust) my parser accordingly.

build.rs

@@ -75,6 +75,7 @@ fn is_expect_fail(name: &str) -> Option<&str> {
         "element_container_priority_footnote_definition_dynamic_block" => Some("Apparently broken begin lines become their own paragraph."),
         "paragraphs_paragraph_with_backslash_line_breaks" => Some("The text we're getting out of the parse tree is already processed to remove line breaks, so our comparison needs to take that into account."),
         "export_snippet_paragraph_break_precedent" => Some("Emacs 28 has broken behavior so the tests in the CI fail."),
+        "trailing_whitespace_blank_lines_after_paragraphs" => Some("Waiting on mailing list response about ownership of the trailing blank lines."),
         _ => None,
     }
 }

org_mode_samples/trailing_whitespace/blank_lines_after_paragraphs.org

@@ -0,0 +1,18 @@
+foo bar.
+
+
+
+
+* Lorem
+baz
+
+
+
+
+* Ipsum
+alpha
+
+
+
+
+beta