Prepare async index for auto_canceled_by_id_convert_to_bigint
What does this MR do and why?
As titled, this is the first step of creating indexes asynchronously. See guideline at https://docs.gitlab.com/ee/development/database/adding_database_indexes.html#schedule-the-index-to-be-created
It's to schedule the index creation for
p_ci_builds.auto_canceled_by_id_convert_to_bigint
as the foreign key constraint requires the index
so that we can later swap auto_canceled_by_id_convert_to_bigint
with auto_canceled_by_id
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Related to #422835 (closed)