Add partition_id to Ci::PipelineChatData

Ref: #430722 (closed)

What does this MR do and why?

This MR cascades partition_id from pipeline to Ci::PipelineChatData.

We need to add this new column in order to redefine the FK association between ci_pipeline_chat_data and ci_pipelines.

Why are we doing this?

In order to partition ci_pipelines all referenced FK must include the partition key as explained in our documentation.

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