Do not collect trailing comments of previous lines

[jesse-shopify]

A discussion revealed that a better path forward is to associate comments to nodes in Prism and use that information in the LSP. That could replace this PR or be a follow-up.

Motivation

• Comments for ivars were including trailing comments from previous lines. With RBS, these trailing comments are often RBS typing information.
• In general, a trailing comment is assumed to be for the line it is on, not subsequent lines

Implementation

• When collecting comments, encountering a trailing comment can stop the collection because no other comments will be for the current node

Automated Tests

• test added

Manual Tests

• a common case will be ivars in initialize with RBS typing, eg

class Foo
  def initialize
    @a = "Hello" #: String
    @b = 123
  end
end

• Hoevering over @b should not display :String

[graphite-app]

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