Add FK including partition_id to ci_builds_runner_session

Ref: #382033 (closed)

What does this MR do and why?

Step 4 to redefine FK referencing ci_builds.

This MR creates the following migrations to redefine our FK to include the partition_id in order to partition ci_builds.

It takes care of the following model.

• Ci::BuildRunnerSession

And follow a simple strategy using only post migrations as this reference ci_builds a high-traffic table:

1. Creates an index
2. Creates the FK
3. Do not validate the FK as it takes 4 hours, it will be done in a Change Request during low traffic over the weekend

This is a similar approach we implemented in !107476 (merged).

MR acceptance checklist

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