Port PR from PBS-Go: Remove Legacy UIDs From Cookie

[cross-repo-issue-creation[bot]]

A PR was merged over on PBS-Go

• https://github.com/prebid/prebid-server/pull/2768
• timestamp: 2023-05-22T22:14:40Z

[bretg]

There is still reference to uidsLegacy in the java codebase as well. This issue tracks its removal.

[vpontesfreestar]

@bretg @markd-fs I just created a PR addressing this port: https://github.com/prebid/prebid-server-java/pull/2818

[SerhiiNahornyi]

Done