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Adds validation for schema_migration prior to truncate.

username-removed-293650 requested to merge mysql_validate_pre_truncate into master

What does this MR do?

Confirms the schema_migrationstable exists before running truncate.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Restoring a GitLab backup to an empty MySQL database fails with:

ActiveRecord::StatementInvalid: Mysql2::Error: Table 'gitlab.schema_migrations' doesn't exist: TRUNCATE schema_migrations

Example at: ZD:

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