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renameInvalidUsernames: Don't try to check if username is valid

Authored by Legoktm.

Description

renameInvalidUsernames: Don't try to check if username is valid

Due to T98757, an invalid username on a certain wiki isn't necessarily
invalid on metawiki (where the script is run). Just assume the list was
created recently and users won't have had their name changed since then.

Also lower the number of concurrent renames.

Change-Id: I5465525a7b5d83f18604d3c0c177efec6de388c1