Revert "Update Assignment requirements for `tier_badge` experiment"

What does this MR do and why?

Revert "Merge branch '408370-update-assignment-requirements-for-tier-badge-experiment' into 'master'"

This reverts merge request !124114 (merged). As during verification, we found out due to exclusion caching, the sample size we are getting for this experiment would be too small. So need to revert back to the original setup.

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