Update nuget e2e test to use unique package names

What does this MR do?

Use unique package names to avoid collisions if packages are left behind

Closes #321425 (closed)

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