Remove support for templates with "."

This was previously deprecated in Rails 6.1 (and never quite behaved
correctly)

actionpack/test/controller/renderer_test.rb

@@ -109,7 +109,6 @@ class RendererTest < ActiveSupport::TestCase
     xml  = "<p>Hello world!</p>\n"
 
     assert_equal html, render["respond_to/using_defaults"]
-    assert_equal xml,  assert_deprecated { render["respond_to/using_defaults.xml.builder"] }
     assert_equal xml,  render["respond_to/using_defaults", formats: :xml]
   end
 

actionview/lib/action_view/template/resolver.rb

@@ -252,7 +252,7 @@ module ActionView
 
       def find_template_paths_from_details(path, details)
         if path.name.include?(".")
-          ActiveSupport::Deprecation.warn("Rendering actions with '.' in the name is deprecated: #{path}")
+          return []
         end
 
         query = build_query(path, details)
@@ -362,8 +362,7 @@ module ActionView
 
       def find_template_paths_from_details(path, details)
         if path.name.include?(".")
-          # Fall back to the unoptimized resolver, which will warn
-          return super
+          return []
         end
 
         candidates = find_candidate_template_paths(path)

actionview/test/template/render_test.rb

@@ -331,13 +331,6 @@ module RenderTestCases
     assert_equal "Hello: davidHello: mary", @view.render(partial: "test/customer", collection: [ Customer.new("david"), Customer.new("mary") ])
   end
 
-  def test_render_partial_collection_with_partial_name_containing_dot
-    assert_deprecated do
-      assert_equal "Hello: davidHello: mary",
-        @view.render(partial: "test/customer.mobile", collection: [ Customer.new("david"), Customer.new("mary") ])
-    end
-  end
-
   def test_render_partial_collection_as_by_string
     assert_equal "david david davidmary mary mary",
       @view.render(partial: "test/customer_with_var", collection: [ Customer.new("david"), Customer.new("mary") ], as: "customer")

actionview/test/template/resolver_shared_tests.rb

@@ -227,13 +227,9 @@ module ResolverSharedTests
     assert_equal "mobile", templates[0].variant
   end
 
-  def test_virtual_path_is_preserved_with_dot
+  def test_returns_no_results_with_dot
     with_file "test/hello_world.html.erb", "Hello html!"
 
-    template = assert_deprecated { context.find("hello_world.html", "test", false, [], {}) }
-    assert_equal "test/hello_world.html", template.virtual_path
-
-    template = context.find("hello_world", "test", false, [], {})
-    assert_equal "test/hello_world", template.virtual_path
+    assert_empty context.find_all("hello_world.html", "test", false, [], {})
   end
 end