Migrate spec/javascripts/lib/ to Jest

Description

Let's migrate the specs in spec/javascripts/lib/ from Karma to Jest.

See the related epic for how to do this.

• spec/javascripts/lib/utils/poll_spec.js
• spec/javascripts/lib/utils/mock_data.js
• spec/javascripts/lib/utils/csrf_token_spec.js
• spec/javascripts/lib/utils/common_utils_spec.js
• spec/javascripts/lib/utils/navigation_utility_spec.js
• spec/javascripts/lib/utils/sticky_spec.js