MergeWorker executes more than 100 SQL queries

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This worker executes more than 100 SQL queries, the maximum number of queries allowed as per MR !154254 (merged). The number of queries should be reduced to less than 100 and the corresponding whitelisted sections of code (Gitlab::QueryLimiting.disable('...')) should be removed.

See https://gitlab.com/gitlab-org/gitlab/-/jobs/6953155045 for example trace

Reference: https://docs.gitlab.com/ee/development/database/query_count_limits.html