Use table_name in SQL queries for Ci::BuildMetadata

What does this MR do and why?

Related to #373239 (closed)

It replaces the usage of ci_builds_metadata with Ci::BuildMetadata.table_name or Ci::BuildMetadata.quoted_table_name because we're planning to partition that table and it will be renamed to p_ci_builds_metadata.

Split out of !100115 (merged)

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