[keyserver] do not filter by role in fetchCommunityInfos calls for script viewers

Summary:
This allows script viewers to receive all community infos irregardless of their role/membership. This work resulted from calling createOrUpdateFarcasterChannelTag with a ghost commbot viewer which resulted in not being able to find the farcaster channel's community info and then a resulting invalid_parameter error

Depends on D13819

Test Plan: This resolved tagging of the farcaster channel community by commbot later in the stack as the function was able to properly fetch the community info

Reviewers: ashoat, varun

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13832