Add a temporary specialized index on project_namespace_id

Alexandru Croitorrequested to merge
add_temp_index_on_null_project_namespace_ids into master

Add a temporary specialized index on project_namespace_id to force optimal index for !83587 (merged)

!83587 (merged) has timestamp 20220324081709 and we need the index to happen before this timestamp so this migration timestamp is 20220323130000

Edited by Alexandru Croitor

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