Update text expectation for Maven QA test

What does this MR do?

Closes https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/647

Text was renamed from "Package was removed" to "Package deleted successfully"

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