Fix batch processing level reporting in core configuration telemetry

[0xnm]

What does this PR do?

batchProcessingLevel has type Int and not Long, this difference made it evaluate to null when extracted from the message bus and safe-casted to Long.

Additional Notes

We probably need to come up with some approach regarding testing the things going through the message bus.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #1698 (1b7c88e) into develop (8196669) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1698      +/-   ##
===========================================
- Coverage    83.40%   83.39%   -0.02%     
===========================================
  Files          465      465              
  Lines        16074    16071       -3     
  Branches      2383     2382       -1     
===========================================
- Hits         13406    13401       -5     
+ Misses        2025     2024       -1     
- Partials       643      646       +3     

Files	Coverage Δ
...d/telemetry/internal/TelemetryCoreConfiguration.kt	88.89% <100.00%> (ø)
...ndroid/telemetry/internal/TelemetryEventHandler.kt	80.12% <100.00%> (-0.60%)	⬇️

... and 18 files with indirect coverage changes