Adding p_ci_build_names table and model

What does this MR do and why?

This MR introduces a p_ci_build_names table. This is to enable searching on build names, as adding an index to p_build_names is not possible to do at this point.

Eventually we want to do a query like: #423904 (comment 1790317452) - But that's for another MR

This MR only setups the table and the models.

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Before	After

How to set up and validate locally

1. Run the database migrations
2. Since the application logic isn't linked up.
3. You can use the console to create a Ci::BuildName record. Populate it, and on save it triggers and generates the search_vector column