Add project_id index on p_ci_pipeline_variables

Max Oreficerequested to merge
morefice/add-index-p-ci-pipeline-variables into master

What does this MR do and why?

Following up !191182 (merged)

This MR adds a project_id index on p_ci_pipeline_variables.

The index was already added on each partition, this MR is defining it on the parent table so each future partition will inherit from it.

Edited by Max Orefice

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