Remove user callouts that are related to attention request

What does this MR do and why?

It's a part of the effort to clean up attention request related data. I'm adding a temporary index as it takes more than a minute to remove these without the index as it was violating our query performance guideline. It'll be removed in a follow up MR.

Related to #371939 (closed) and &8650 (closed)

Datatebase

Query plan(without batch processing): https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/11815/commands/42006

Up

# rake db:migrate

main: == 20220901071310 AddTmpIndexUserCalloutsOnAttentionRequestFeatureNames: migrating
main: -- transaction_open?()
main:    -> 0.0000s
main: -- index_exists?(:user_callouts, [:id], {:where=>"feature_name IN (47,48)", :name=>"tmp_index_user_callouts_on_attention_request_feature_names", :algorithm=>:concurrently})
main:    -> 0.0146s
main: -- execute("SET statement_timeout TO 0")
main:    -> 0.0005s
main: -- add_index(:user_callouts, [:id], {:where=>"feature_name IN (47,48)", :name=>"tmp_index_user_callouts_on_attention_request_feature_names", :algorithm=>:concurrently})
main:    -> 0.0084s
main: -- execute("RESET statement_timeout")
main:    -> 0.0009s
main: == 20220901071310 AddTmpIndexUserCalloutsOnAttentionRequestFeatureNames: migrated (0.0378s)

main: == 20220901071355 CleanupAttentionRequestUserCallouts: migrating ==============
main: == 20220901071355 CleanupAttentionRequestUserCallouts: migrated (0.0079s) =====

ci: == 20220901071310 AddTmpIndexUserCalloutsOnAttentionRequestFeatureNames: migrating
ci: -- transaction_open?()
ci:    -> 0.0000s
ci: -- index_exists?(:user_callouts, [:id], {:where=>"feature_name IN (47,48)", :name=>"tmp_index_user_callouts_on_attention_request_feature_names", :algorithm=>:concurrently})
ci:    -> 0.0060s
ci: -- execute("SET statement_timeout TO 0")
ci:    -> 0.0004s
ci: -- add_index(:user_callouts, [:id], {:where=>"feature_name IN (47,48)", :name=>"tmp_index_user_callouts_on_attention_request_feature_names", :algorithm=>:concurrently})
ci:    -> 0.0122s
ci: -- execute("RESET statement_timeout")
ci:    -> 0.0006s
ci: == 20220901071310 AddTmpIndexUserCalloutsOnAttentionRequestFeatureNames: migrated (0.0243s)

ci: == 20220901071355 CleanupAttentionRequestUserCallouts: migrating ==============
ci: -- The migration is skipped since it modifies the schemas: [:gitlab_main].
ci: -- This database can only apply migrations in one of the following schemas: [:gitlab_ci, :gitlab_shared, :gitlab_internal].
ci: == 20220901071355 CleanupAttentionRequestUserCallouts: migrated (0.0002s) =====

Down

# rake db:migrate:down:main VERSION=20220901071355

main: == 20220901071355 CleanupAttentionRequestUserCallouts: reverting ==============
main: == 20220901071355 CleanupAttentionRequestUserCallouts: reverted (0.0019s) =====

# rake db:migrate:down:main VERSION=20220901071310

main: == 20220901071310 AddTmpIndexUserCalloutsOnAttentionRequestFeatureNames: reverting
main: -- transaction_open?()
main:    -> 0.0000s
main: -- indexes(:user_callouts)
main:    -> 0.0374s
main: -- execute("SET statement_timeout TO 0")
main:    -> 0.0004s
main: -- remove_index(:user_callouts, {:algorithm=>:concurrently, :name=>"tmp_index_user_callouts_on_attention_request_feature_names"})
main:    -> 0.0190s
main: -- execute("RESET statement_timeout")
main:    -> 0.0011s
main: == 20220901071310 AddTmpIndexUserCalloutsOnAttentionRequestFeatureNames: reverted (0.0862s)

# rake db:migrate:down:ci VERSION=20220901071355

ci: == 20220901071355 CleanupAttentionRequestUserCallouts: reverting ==============
ci: -- The migration is skipped since it modifies the schemas: [:gitlab_main].
ci: -- This database can only apply migrations in one of the following schemas: [:gitlab_ci, :gitlab_shared, :gitlab_internal].
ci: == 20220901071355 CleanupAttentionRequestUserCallouts: reverted (0.0001s) =====

# rake db:migrate:down:ci VERSION=20220901071310

ci: == 20220901071310 AddTmpIndexUserCalloutsOnAttentionRequestFeatureNames: reverting
ci: -- transaction_open?()
ci:    -> 0.0000s
ci: -- indexes(:user_callouts)
ci:    -> 0.0182s
ci: -- execute("SET statement_timeout TO 0")
ci:    -> 0.0009s
ci: -- remove_index(:user_callouts, {:algorithm=>:concurrently, :name=>"tmp_index_user_callouts_on_attention_request_feature_names"})
ci:    -> 0.0047s
ci: -- execute("RESET statement_timeout")
ci:    -> 0.0004s
ci: == 20220901071310 AddTmpIndexUserCalloutsOnAttentionRequestFeatureNames: reverted (0.0500s)

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