Add graphql required param to the importStart

What does this MR do?

In !34609 (merged) we introduced a new graphQL param but didn't change the frontend. This MR changes this.

The actual values will be added as part of !33320 (merged)

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

Related issue: #225409 (closed)