FIX: Remove strict-dynamic-specific logic from CSP extensions (#25725)

This data is cached, so we don't want to include any site-specific-logic in there. Let's just keep the old URL-collecting behaviour, and let it be stripped out by `CSP::Builder` at runtime.

lib/content_security_policy/extension.rb

@@ -56,40 +56,38 @@ class ContentSecurityPolicy
         ThemeModifierHelper.new(theme_ids: theme_ids).csp_extensions,
       )
 
-      if !SiteSetting.content_security_policy_strict_dynamic
-        html_fields =
-          ThemeField.where(
-            theme_id: theme_ids,
-            target_id: ThemeField.basic_targets.map { |target| Theme.targets[target.to_sym] },
-            name: ThemeField.html_fields,
-          )
+      html_fields =
+        ThemeField.where(
+          theme_id: theme_ids,
+          target_id: ThemeField.basic_targets.map { |target| Theme.targets[target.to_sym] },
+          name: ThemeField.html_fields,
+        )
 
-        auto_script_src_extension = { script_src: [] }
-        html_fields.each(&:ensure_baked!)
-        doc = html_fields.map(&:value_baked).join("\n")
+      auto_script_src_extension = { script_src: [] }
+      html_fields.each(&:ensure_baked!)
+      doc = html_fields.map(&:value_baked).join("\n")
 
-        Nokogiri::HTML5
-          .fragment(doc)
-          .css("script[src]")
-          .each do |node|
-            src = node["src"]
-            uri = URI(src)
+      Nokogiri::HTML5
+        .fragment(doc)
+        .css("script[src]")
+        .each do |node|
+          src = node["src"]
+          uri = URI(src)
 
-            next if GlobalSetting.cdn_url && src.starts_with?(GlobalSetting.cdn_url) # Ignore CDN urls (theme-javascripts)
-            next if uri.host.nil? # Ignore same-domain scripts (theme-javascripts)
-            next if uri.path.nil? # Ignore raw hosts
+          next if GlobalSetting.cdn_url && src.starts_with?(GlobalSetting.cdn_url) # Ignore CDN urls (theme-javascripts)
+          next if uri.host.nil? # Ignore same-domain scripts (theme-javascripts)
+          next if uri.path.nil? # Ignore raw hosts
 
-            uri.query = nil # CSP should not include query part of url
+          uri.query = nil # CSP should not include query part of url
 
-            uri_string = uri.to_s.sub(%r{\A//}, "") # Protocol-less CSP should not have // at beginning of URL
+          uri_string = uri.to_s.sub(%r{\A//}, "") # Protocol-less CSP should not have // at beginning of URL
 
-            auto_script_src_extension[:script_src] << uri_string
-          rescue URI::Error
-            # Ignore invalid URI
-          end
+          auto_script_src_extension[:script_src] << uri_string
+        rescue URI::Error
+          # Ignore invalid URI
+        end
 
-        extensions << auto_script_src_extension
-      end
+      extensions << auto_script_src_extension
 
       extensions
     end