List identeties does n+1

[Flo4604]

Currently when listing identeties it takes a long time because for each identity we select ratelimits in a seperate query.

This should be done using json_arrayagg in the list identities query instead.

• [ ] Select ratelimits by joining the data in the db.Query.ListIdentities query
• [ ] Remove db.Query.ListIdentityRatelimits n+1

[linear[bot]]

ENG-2142