Run Rest Integ Tests with the Security plugin installed

[cwperks]

Description

Opening up a Draft PR to start soliciting feedback. The goal of this PR is to run integ tests in this repo with the security plugin installed. This PR is a step towards being able to add tests for #347.

With the change in this PR you can run the sample-extension-plugin with security using ./gradlew :opensearch-job-scheduler-sample-extension:run -Dsecurity=true -Dhttps=true -Dtests.opensearch.username=admin -Dtests.opensearch.password=admin -x integTest

And run integTest with security like:

./gradlew :opensearch-job-scheduler-sample-extension:integTest -Dsecurity=true -Dhttps=true -Dtests.opensearch.username=admin -Dtests.opensearch.password=admin -Duser=admin -Dpassword=admin -Dtests.opensearch.secure=true -i --tests "*RestIT"

Example response to CAT plugins

> curl -XGET https://admin:admin@localhost:9200/_cat/plugins -k
integTest-0 opensearch-job-scheduler                  3.0.0.0-SNAPSHOT
integTest-0 opensearch-job-scheduler-sample-extension 3.0.0.0-SNAPSHOT
integTest-0 opensearch-security                       3.0.0.0-SNAPSHOT

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[cwperks]

@prudhvigodithi I switched this to ready for review to start soliciting feedback, but I am still working on a change to remove duplication between the SPI and the sample-extension-plugin which both perform integ tests and have some classes in common. I was able to create a separate sourceSet with common test classes, but had some trouble bundling the resources like the certificates.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.67%. Comparing base (6e3e68a) to head (461b8c7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #645   +/-   ##
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  Coverage     37.67%   37.67%           
  Complexity      135      135           
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  Files            22       22           
  Lines          1189     1189           
  Branches        109      109           
=========================================
  Hits            448      448           
  Misses          704      704           
  Partials         37       37           

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