refactor: use JobProgress tracking in data value import [DHIS2-18885]

[jbee]

Summary

This started as a cleanup PR for Notifier stuff but I found that the ADX import multi-threading solution messed up the notification messages as messages from different threads were writing into the same notification list. Looking into that I ended up removing the cause of the problem by streamlining the ADX data value import.

• makes ADX fully synchronous (no user context issues, no notification mixup)
• adds progress tracking in the data value set import to get more insight into the import
• adds JobProgress#setWorkItemBucketing to prevent too many items by "merging" n items into one "bucket" item

Automatic Testing

Existing tests were adjusted.

Manual Testing

• goto import/export app
• export some data as ADX
• import the ADX file again
• also try importing other formats, JSON, XML and observe the job progress shown

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud