Add hover tip for show links toggle

What does this MR do?

This adds the tip for hovering on jobs to the Job dependencies view. See #326287 (closed). Once the link is dismissed it does not return. The backend is in !59965 (merged).

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

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Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.

Related to #326287 (closed)