Change capybara screenshots name

This MR updates our screenshots files names taken on test failures:
- Remove timestamps
- Use RSpec full_description method instead of the file_path

changelogs/unreleased/mo-change-capybara-screenshots-name.yml

+---
+title: Change capybara screenshots files names taken on tests failures
+merge_request: 26788
+author:
+type: changed

qa/qa/runtime/browser.rb

@@ -122,8 +122,10 @@ module QA
           driver.browser.save_screenshot(path)
         end
 
+        Capybara::Screenshot.append_timestamp = false
+
         Capybara::Screenshot.register_filename_prefix_formatter(:rspec) do |example|
-          ::File.join(QA::Runtime::Namespace.name, example.file_path.sub('./qa/specs/features/', ''))
+          ::File.join(QA::Runtime::Namespace.name, example.full_description.downcase.parameterize(separator: "_")[0..99])
         end
 
         Capybara.configure do |config|

spec/support/capybara.rb

@@ -79,6 +79,11 @@ Capybara.ignore_hidden_elements = true
 Capybara.default_normalize_ws = true
 Capybara.enable_aria_label = true
 
+Capybara::Screenshot.append_timestamp = false
+
+Capybara::Screenshot.register_filename_prefix_formatter(:rspec) do |example|
+  ::File.join(QA::Runtime::Namespace.name, example.full_description.downcase.parameterize(separator: "_")[0..99])
+end
 # Keep only the screenshots generated from the last failing test suite
 Capybara::Screenshot.prune_strategy = :keep_last_run
 # From https://github.com/mattheworiordan/capybara-screenshot/issues/84#issuecomment-41219326