Follow-up from "Update feature specs to reflect new project members view"

The following discussion from !52549 (merged) should be addressed:

• @ebaque started a discussion:

  Not related to this MR (so please feel free to create a follow up issue if you prefer): the module name (MembersHelpers) does not match the file name (members_table_helpers.rb), and it can be a bit confusing.

  Can the file be renamed accordingly?