Implement Stage 2 BLIS update - apply database migrations

[hakiatalov]

As the BLIS-NG System Update
I want to apply database updates found in the update artifact
so that the database schema supports the new BLIS application runtime.

• The launcher starts the MySQL database and creates a backup of the entire existing database.
• The launcher applies database migrations by executing each .sql file in the releases\<version>\db\migrations\ directory, in order, via mysql.exe.

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AC

1. Given an BLIS update artifact, When the artifact contains db migrations, Then the db migrations are applied to the database.
2. Given pending db migrations, When the migration process begins, Then a backup of the old database is created to support rollbacks.