Make the job#successful? method wait by refreshing

What does this MR do?

Improves the waiting of the Page::Project::Job::Show#successful? method.

Previously, there was simply a guard clause and some waiting.

This improvement will refresh the page every interval until the condition is met.

This can help edge cases, including https://gitlab.com/gitlab-org/quality/nightly/-/jobs/179955878 where a job is queued, but hasn't started. (build output hasn't appeared)

What are the relevant issue numbers?

• https://gitlab.com/gitlab-org/quality/nightly/issues/71
• https://gitlab.com/gitlab-org/quality/nightly/issues/81
• https://gitlab.com/gitlab-org/quality/nightly/issues/82

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated via this MR
• [-] Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• [-] Security reports checked/validated by reviewer