Parser: Improve ERB case node and end tag matching

[marcoroth]

This pull request improves the parser by properly matching <% end %> tags to ERBCaseNode when no when/in clauses are present.

For the following example:

<% case 1 %>
<% end %>

The reported errors are now reduced to 1, down from 3.

Before

Errors (3 total)

  1. RubyParseError at test.html.erb:1:3
     case_missing_conditions: expected a `when` or `in` clause after `case`

  2. MissingERBEndTagError at test.html.erb:1:0
     `<% case %>` started here but never closed with an end tag. The end tag may be in a different scope.

  3. ERBControlFlowScopeError at test.html.erb:2:0
     `<% end %>` appears outside its control flow block. Keep ERB control flow statements together within the same HTML scope (tag, attribute, or content).

After

Errors (1 total)

  1. RubyParseError at test.html.erb:1:3
     case_missing_conditions: expected a `when` or `in` clause after `case`

Inspired by ruby-gettext/gettext#117

/cc @joelhawksley

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@1237

npx https://pkg.pr.new/@herb-tools/language-server@1237

npx https://pkg.pr.new/@herb-tools/linter@1237

commit: 99a25b7

[github-actions]

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