Deploy scripts:

- enabled support to drop QuestDB tables during deploy
- renamed variable QDB_TABLE to QDB_TABLE_MONITORING_KPIS
- renamed default table name tfs_monitoring to tfs_monitoring_kpis
- renamed secret attribute METRICSDB_TABLE to METRICSDB_TABLE_MONITORING_KPIS
- improved log messages of tfs.sh
- updated deploy scripts accordingly
- removed unused variables and commands
- corrected documentation of some variables