Fix partition ids for ci_job_variables records

What does this MR do and why?

This MR fixes invalid ci_job_variables records in production and sets the partition_id to 100.

Database

We have around 128 records to fix.

select count(*) from ci_job_variables where partition_id = 101;

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #387301 (closed)