Fix PostgreSQL upgrade to support multiple versions and upgrade TimescaleDB in all databases #11
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Removed PG_MAJOR_PREVIOUS variable and now explicitly copy PostgreSQL 14 and 15 for upgrade support. Fixed TimescaleDB upgrade logic to use correct DB_VERSION when finding extension files on old server. Updated upgrade process to iterate through all databases and upgrade TimescaleDB extension in each, which is critical after pg_upgrade since it copies extension metadata but doesn't upgrade extensions.