Prepare the async index for ci_pipeline_variables
What does this MR do and why?
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_pipeline_variables
' id_convert_to_bigint
See the reason from !120823 (comment 1391556601)
Because this index creation takes a long time to finish, we will need to add it asynchronously instead
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Related to #408936 (closed)