Adds parent template tracking to snippet drops

Enhances snippet drops to track their parent template name, enabling better error reporting and context awareness within rendered snippets.

Updates the render tag to use parent template names for proper context variable naming and improves error handling flow.

test/integration/tags/snippet_test.rb

@@ -482,22 +482,39 @@ class SnippetTest < Minitest::Test
     end
 
     def test_render_with_non_existent_tag
-      template = Liquid::Template.parse(<<~LIQUID.chomp, line_numbers: true)
+      template = <<-LIQUID
         {% snippet foo %}
-        {% render non_existent %}
-        {% endsnippet %}
+          Hello,
 
-        {% render foo %}
+          {{ errors.standard_error }} will raise a standard error.
+
+          Bla bla test.
+
+          {{ errors.syntax_error }} will raise a syntax error.
+
+          This is an argument error: {{ errors.argument_error }}
+
+          Bla.
+        {% endsnippet %}
+        {%- render foo -%}
       LIQUID
 
-      expected = <<~TEXT
+      expected = <<-TEXT
+        Hello,
 
+        Liquid error (line 3): standard error will raise a standard error.
 
+        Bla bla test.
 
-        Liquid error (foo line 2): No such template 'non_existent'
+        Liquid syntax error (line 7): syntax error will raise a syntax error.
+
+        This is an argument error: Liquid error (line 9): argument error
+
+        Bla.
       TEXT
 
-      assert_equal(expected, template.render('errors' => ErrorDrop.new))
+      output = Liquid::Template.parse(template, line_numbers: true).render('errors' => ErrorDrop.new)
+      assert_equal(expected, output)
     end
   end