Linter: Add support for as: in actionview-prefer-collection-render

[marcoroth]

This pull request updates the actionview-prefer-collection-render linter rule so the replacement it reports keeps working when the loop passes the element under a name that isn't the partial name.

The rule reports the exact tag to paste over the loop, and it built that tag from the receiver and the partial alone. Collection rendering names the local after the partial, so any local named something else was silently dropped from the suggestion:

<% @gems.each do |topic_gem| %>
  <%= render partial: "gem_card", locals: { topic_gem: topic_gem } %>
<% end %>

Prefer `<%= render partial: "gem_card", collection: @gems %>` over rendering a partial once per iteration.

Following that advice hands _gem_card.html.erb a gem_card local, while the partial still reads topic_gem, so the page raises undefined local variable or method 'topic_gem'. The suggestion now compares the local's key against the name collection rendering would use and appends as: when the two differ:

- Prefer `<%= render partial: "gem_card", collection: @gems %>` over rendering a partial once per iteration.
+ Prefer `<%= render partial: "gem_card", collection: @gems, as: :topic_gem %>` over rendering a partial once per iteration.

That implicit name is the last path segment of the partial, so a nested partial whose local already matches keeps the shorter form and doesn't grow a redundant as::

<% @gems.each do |gem_card| %>
  <%= render partial: "gems/gem_card", locals: { gem_card: gem_card } %>
<% end %>

Both spellings of the local are covered, the explicit locals: hash and the shorthand render "gem_card", topic_gem: topic_gem. The object shorthand (render user inside the loop) is unaffected, since render @users carries no local name to rename.

When the parser reports a local without a name, the rule now stays silent instead of reporting a replacement it can't verify.

Resolves #1981

[github-actions]

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_{🌱 Grown from commit 13213c5}

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[pkg-pr-new]

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commit: 13213c5