Fixing URL shortening for URLs with Arabic characters.

When URLs have unescaped Arabic characters, they are not extracted correctly. This happens not only with the library we use (`twitter-text`), but also with Ruby's `uri` library and `postrank-uri` gem:

```
irb(main):009:0> PostRank::URI.extract('https://fatabyyano.net/هذا-المقطع-ليس-لاشتباكات-حديثة-بين-الج/')
=> ["https://fatabyyano.net/"]
irb(main):010:0> URI.extract('https://fatabyyano.net/هذا-المقطع-ليس-لاشتباكات-حديثة-بين-الج/')
=> ["https://fatabyyano.net/"]
irb(main):011:0> Twitter::TwitterText::Extractor.extract_urls('https://fatabyyano.net/هذا-المقطع-ليس-لاشتباكات-حديثة-بين-الج/')
=> ["https://fatabyyano.net/"]
```

So, the fix here is to first escape URLs that contain Arabic characters before sending them to the URL extraction method when shortening URLs.

Fixes CV2-3690.

lib/url_rewriter.rb

@@ -20,7 +20,10 @@ def self.utmize(url, source)
     end
   end
 
-  def self.shorten_and_utmize_urls(text, source = nil, owner = nil)
+  def self.shorten_and_utmize_urls(input_text, source = nil, owner = nil)
+    text = input_text
+    # Encode URLs in Arabic which are not detected by the URL extraction methods
+    text = text.gsub(/https?:\/\/[\S]+/) { |url| Addressable::URI.escape(url) } if input_text =~ /\p{Arabic}/
     entities = Twitter::TwitterText::Extractor.extract_urls_with_indices(text, extract_url_without_protocol: true)
     # Ruby 2.7 freezes the empty string from nil.to_s, which causes an error within the rewriter
     Twitter::TwitterText::Rewriter.rewrite_entities(text || '', entities) do |entity, _codepoints|

test/lib/url_rewriter_test.rb

@@ -50,4 +50,13 @@ def teardown
       assert_equal url, UrlRewriter.shorten(url, nil)
     end
   end
+
+  test 'should shorten Arabic URL' do
+    shortened = nil
+    stub_configs({ 'short_url_host_display' => 'https://chck.media' }) do
+      shortened = UrlRewriter.shorten_and_utmize_urls('Visit https://fatabyyano.net/هذا-المقطع-ليس-لاشتباكات-حديثة-بين-الج/ for more information.', nil)
+    end
+    assert_equal 'https://fatabyyano.net/%D9%87%D8%B0%D8%A7-%D8%A7%D9%84%D9%85%D9%82%D8%B7%D8%B9-%D9%84%D9%8A%D8%B3-%D9%84%D8%A7%D8%B4%D8%AA%D8%A8%D8%A7%D9%83%D8%A7%D8%AA-%D8%AD%D8%AF%D9%8A%D8%AB%D8%A9-%D8%A8%D9%8A%D9%86-%D8%A7%D9%84%D8%AC/', Shortener::ShortenedUrl.last.url
+    assert_match /^Visit https:\/\/chck\.media\/[a-zA-Z0-9]+ for more information\.$/, shortened
+  end
 end