fix: count & orderBy on one2m with multiple fks

[Weakky]

Overview

Fixes prisma/prisma#7299
Fixes prisma/prisma#7331

This PR also fixes an orderByRelation issue (7331 above) which is using the compute_one2m_join function that I batched fixed in this PR as the root cause was exactly the same as the count aggregation one.

Changes

LEFT JOIN in charge of computing the count aggregation changes from (pseudo-sql):

  LEFT JOIN (
      SELECT fk_1, fk_2, COUNT(*) FROM ... GROUP BY fk_1, fk_2
  ) AS aggr ON (
    fk_1 = "aggr"."fk1",
    fk_2 = "aggr"."fk2"
  )

to:

  LEFT JOIN (
      SELECT fk_1, fk_2, COUNT(*) FROM ... GROUP BY fk_1, fk_2
  ) AS aggr ON (
    fk_1 = "aggr"."fk1" AND
    fk_2 = "aggr"."fk2"
  )