Prepare async index for pipeline_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
ci_sources_pipelines.pipeline_id_convert_to_bigint and
ci_sources_pipelines.source_pipeline_id_convert_to_bigint
as the foreign key constraint requires the index
so that we can later swap pipeline_id_convert_to_bigint with pipeline_id
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
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Related to #422826 (closed)