Add UT hit error scaling factor as a condition

UT hit error has been assigned as pitch size / sqrt(12). However, when processing real data, this error is deemed to be too small and an effective scaling factor has been included. Instead of hard coded a static value, it's favorable to consider this factor as a condition, as it depends on the accuracy of alignment which can change over time. It's accessible via DeUTSector::hitErrorFactor( unsigned int clusterSize ) with this MR.

Work with Detector!573 (merged), Rec!3963 (merged), lhcb-conddb/lhcb-conditions-database!150 (merged)