feat(format/yaml): block scalar trailing comment lines

[dyc3]

Summary

More comment handling in block scalars, and removes the last verbatim formatting call.

I'll let the clanker explain

A non-empty line indented less than the base ends a block scalar per
the spec, but the lexer includes such lines (trailing comments, in
practice) in the content token, and the formatter fell back to
verbatim. The content now ends at the first such line; the blank
lines the chomping dropped and the comment lines after them print after the scalar, dedented to the document root:

        strip: |-
          # text

        # comment

Whitespace-only lines at or below the base indentation now count as
empty for chomping. This removes the last verbatim fallback.

implemented by fable 5

Test Plan

updated snapshots

Docs

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[ematipico]

Comments here are like hell :D