[FieldFormatters] Add support for rawValue in url label (elastic#204192)

## Summary

This PR adds support for ``{{rawValue}}`` in url label.

Closes: elastic#188973

src/plugins/field_formats/common/converters/url.test.ts

@@ -139,14 +139,22 @@ describe('UrlFormat', () => {
       expect(url.convert('url', TEXT_CONTEXT_TYPE)).toBe('external url');
     });
 
-    test('can use the raw value', () => {
+    test('can use the raw value with {{value}}', () => {
       const url = new UrlFormat({
         labelTemplate: 'external {{value}}',
       });
 
       expect(url.convert('url?', TEXT_CONTEXT_TYPE)).toBe('external url?');
     });
 
+    test('can use the raw value with {{rawValue}}', () => {
+      const url = new UrlFormat({
+        labelTemplate: 'external {{rawValue}}',
+      });
+
+      expect(url.convert('url?', TEXT_CONTEXT_TYPE)).toBe('external url?');
+    });
+
     test('can use the url', () => {
       const url = new UrlFormat({
         urlTemplate: 'http://google.com/{{value}}',

src/plugins/field_formats/common/converters/url.ts

@@ -86,6 +86,7 @@ export class UrlFormat extends FieldFormat {
     return this.compileTemplate(template)({
       value,
       url,
+      rawValue: value,
     });
   }