Migrate work item iteration widget to MSW

Anastasia Khomchenkorequested to merge
ak/migrate-widgets-to-msw into master

What does this MR do and why?

Related to https://gitlab.com/gitlab-org/plan-stage/plan-engineering/-/work_items/1417

Migrates the work item iteration widget from Capybara to an MSW integration test.

Second slice of the sidebar widget migration (following weight widget). I want to follow Health and status in separate MRs.

References

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Before After

How to set up and validate locally

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Edited by Anastasia Khomchenko

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