E2E: Add possibility to run tests with 'bundle exec rspec' command

qa/.rspec

qa/.rspec_internal

qa/qa.rb

qa/qa/scenario/template.rb

qa/qa/scenario/test/integration/mattermost.rb

...atures/shared_contexts/merge_train_spec_with_user_prep.rb

...tures/shared_contexts/packages_registry_shared_context.rb

...es/shared_contexts/variable_inheritance_shared_context.rb

.../shared_examples/merge_with_code_owner_shared_examples.rb

qa/qa/specs/qa_deprecation_toolkit_env.rb

qa/qa/specs/spec_helper.rb

qa/qa/support/gitlab_address.rb

qa/qa/support/knapsack_report.rb

qa/spec/README.md

qa/spec/scenario/template_spec.rb

qa/spec/scenario/test/integration/mattermost_spec.rb

qa/spec/scenario_shared_examples.rb

qa/spec/spec_helper.rb

qa/spec/specs/spec_helper.rb

qa/tasks/knapsack.rake