Made the send_keys helper work in selenium as well as cuprite (#3328)

A few of the test helpers use the `type` helper method but in selenium it raises this error:

     NoMethodError:
       undefined method `keyboard' for #<Selenium::WebDriver::Chrome::Driver:0x000000013ebbb950>

I've changed this to check if the `keyboard` property exists and if it does not, try sending keys to the page instead (which works in selenium).

lib/avo/test_helpers.rb

@@ -315,7 +315,11 @@ def tag_suggestions(field:, input:)
     end
 
     def type(...)
-      page.driver.browser.keyboard.type(...)
+      if page.driver.browser.respond_to?(:keyboard)
+        page.driver.browser.keyboard.type(...)
+      else
+        page.send_keys(...)
+      end
     end
 
     def accept_custom_alert(&block)