Swap primary key with bigint column for ci_pipeline_variables
What does this MR do and why?
Swap the integer primary key with bigint column for ci_pipeline_variables
See the second step at https://docs.gitlab.com/ee/development/database/avoiding_downtime_in_migrations.html#swap-the-columns-release-n--1
The first step !118878 (merged) is merged and executed on production, see #408936 (comment 1391375272)
The unique index index_on_ci_pipeline_variables_on_id_convert_to_bigint
is created by !120946 (merged) (async prepare) and !120950 (merged) (concurrent create)
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Related to #408936 (closed)