Linter: Implement actionview-strict-locals-partial-only rule

[marcoroth]

This pull request adds a new actionview-strict-locals-partial-only linter rule that detects strict locals declarations in files that are not Rails partials.

Strict locals are only supported in partials (templates whose filename begins with an underscore), so a declaration in any other template has no effect.

Good

app/views/users/_card.html.erb

<%# locals: (user:) %>

<div class="user-card">
  <%= user.name %>
</div>

Bad

app/views/users/show.html.erb

<%# locals: (user:) %>

<div class="user-card">
  <%= user.name %>
</div>

app/components/card_component.html.erb

<%# locals: (title:) %>

<div class="card"><%= title %></div>

Resolves #1464

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@1463

npx https://pkg.pr.new/@herb-tools/language-server@1463

npx https://pkg.pr.new/@herb-tools/linter@1463

commit: fa20fc7

[github-actions]

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