Stop prometheus in doctest build.gradle now runs upon project failure in startOpenSearch

[MitchellGale]

startOpenSearch is now finalizedBy stopPrometheus allowing stop prometheus to run after crash. This stops a left-over prometheus instance from running after causing future start Prometheus tasks from running.

Steps to reproduce error that is fixed.

1. Run an OpenSearch instance
2. Run build in OpenSearch SQL
3. Observe that OpenSearch SQL crashes due to step 1
4. Stop OpenSearch instance started in step 1
5. Re-run build for OpenSearch SQL
6. Observe that there is error about Prometheus already running.

Same steps can be taken working from this PR branch and it will not show the error in step 6.

Issues Resolved

1083

Check List

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

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@@                  Coverage Diff                   @@
##             Integ/FixPrometheus     #276   +/-   ##
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  Coverage                       ?   97.41%           
  Complexity                     ?     4558           
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  Files                          ?      388           
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  Branches                       ?      790           
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  Hits                           ?    10947           
  Misses                         ?      284           
  Partials                       ?        7           

Flag	Coverage Δ
sql-engine	97.41% <0.00%> (?)

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