Delete "datastash" which was a dockerfile to use logstash.

[gregschohn]

Description

Delete "datastash" which was a dockerfile to use logstash. This isn't tested much and isn't something worth supporting at this point, now that snapshot reindexing is in place.

Testing

Just the CICD checks. I don't believe that this is used anywhere.

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.98%. Comparing base (d99beb6) to head (2834fbb).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #998   +/-   ##
=========================================
  Coverage     78.98%   78.98%           
  Complexity     2723     2723           
=========================================
  Files           375      375           
  Lines         13869    13869           
  Branches        970      970           
=========================================
  Hits          10955    10955           
  Misses         2340     2340           
  Partials        574      574           

Flag	Coverage Δ
gradle-test	76.80% <ø> (ø)
python-test	89.90% <ø> (ø)

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