Migrate ee mr_widget_pipeline_container_spec to Jest

What does this MR do?

Moves ee/spec/javascripts/vue_mr_widget/components/mr_widget_pipeline_container_spec.js to ee/spec/frontend/vue_mr_widget/components/mr_widget_pipeline_container_spec.js

Related to #194309 (closed)

Also takes ee/spec/javascripts/vue_mr_widget/ee_mr_widget_options_spec.js along with it because we suspected that moving the above file out of Karma may have been responsible for the pipeline failure in Karma after moving it to Jest.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

References

• Pair Programming - Moving a huge jest spec (ee_mr_widget_options_spec)