Add lock discussion and confidentiality feature specs

What does this MR do and why?

Add lock discussion and confidentiality feature specs for work items

Also:

• Update specs to adhere to our UI testing guidelines for readability
• Combine some specs for efficiency since feature specs are expensive
• Move shared examples files into work_items directory

References

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MR acceptance checklist

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Screenshots or screen recordings

The work item page, for reference:

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