Adding integ tests for scenario of hybrid query with aggregations

[martin-gaievski]

Description

Adding more integration tests for aggregations when they are used together with hybrid query. Picked 20 aggregations from official documentation.

Key points:

• each aggregation test has two flavors: with and without concurrent search
• added flag that controls if these tests needs to be executed or skipped as part of the full integ test suite run. By default tests are skipped
• added github action that runs all tests daily

Example of test run:

./gradlew ':integTest' -Dtest_aggs=true --tests "org.opensearch.neuralsearch.query.aggregation.*IT"

=======================================
OpenSearch Build Hamster says Hello!
  Gradle Version        : 8.4
  OS Info               : Mac OS X 13.6.4 (x86_64)
  JDK Version           : 21 (Amazon Corretto JDK)
  JAVA_HOME             : /Users/user/.sdkman/candidates/java/21.0.1-amzn
  Random Testing Seed   : 449B74C95C0B7B77
  In FIPS 140 mode      : false
=======================================

> Task :integTest
Mar 12, 2024 3:33:35 PM sun.util.locale.provider.LocaleProviderAdapter <clinit>
WARNING: COMPAT locale provider will be removed in a future release

Deprecated Gradle features were used in this build, making it incompatible with Gradle 9.0.

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.

For more on this, please refer to https://docs.gradle.org/8.4/userguide/command_line_interface.html#sec:command_line_warnings in the Gradle documentation.

BUILD SUCCESSFUL in 3m 2s
22 actionable tasks: 3 executed, 19 up-to-date

Issues Resolved

#509

Check List

• New functionality includes testing.
  • All tests pass
• Commits are signed as 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.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.62%. Comparing base (fcb80a3) to head (edd02e3).
Report is 12 commits behind head on main.

❗ Current head edd02e3 differs from pull request most recent head 19e2adf. Consider uploading reports for the commit 19e2adf to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #632   +/-   ##
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  Coverage     82.62%   82.62%           
  Complexity      666      666           
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  Files            52       52           
  Lines          2072     2072           
  Branches        334      334           
=========================================
  Hits           1712     1712           
  Misses          212      212           
  Partials        148      148           

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