Support uploading a new state-dump.latest.json file to DTL.

[mmontour1306]

Support uploading a new state-dump.latest.json file to DTL.

Also cleans up some debug messages and returns '500' error
rather than '400' on unhandled errors.

Changes to be committed:
modified: ../packages/data-transport-layer/src/services/main/service.ts

[codecov-commenter]

Codecov Report

Merging #528 (b72257e) into develop (fee1cf4) will not change coverage.
The diff coverage is n/a.

❗ Current head b72257e differs from pull request most recent head 8a4f686. Consider uploading reports for the commit 8a4f686 to get more accurate results

@@           Coverage Diff            @@
##           develop     #528   +/-   ##
========================================
  Coverage    76.10%   76.10%           
========================================
  Files           81       81           
  Lines         3038     3038           
  Branches       469      469           
========================================
  Hits          2312     2312           
  Misses         726      726           

Flag	Coverage Δ
batch-submitter	59.59% <ø> (ø)
contracts	86.05% <ø> (ø)
core-utils	68.16% <ø> (ø)
data-transport-layer	37.68% <ø> (ø)
message-relayer	72.22% <ø> (ø)

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