Export job - prevent exceptions during the initial run (RTC-41028)

Update to prevent exceptions during the initial run of job for new blob types.

Adjustment in exported flight blobs (RTC-41151)

The following changes to the flight blobs were implemented:

• Reporting.Export.FlightSaleStatistics:
  • set encoding of the file to UTF-8 BOM,
  • add prefix EG_ to the filename,
  • remove header,
  • column Quantity: round to the nearest whole number (no decimals),
  • column Amount: keep 4 decimals only,
  • column ScheduledDateTimeUtc: value for fake and dummy flights should be: 9999-12-31 22:59
• Reporting.Export.MemberFlightSaleStatistics:
  • set encoding to UTF-8 BOM.