Accepts https as a property to set securityEnabled flag

[DarshitChanpura]

• Related to https://github.com/opensearch-project/index-management/issues/1086

• The error:

  
  Build file '/local/home/dchanp/codebase/index-management/build.gradle' line: 441

• What went wrong: Execution failed for task ':integTest'.

  cluster{::integTest} failed to wait for cluster health yellow after 40 SECONDS Unexpected end of file from server

Upon investigation I discovered that the integration tests triggered by opensearch-build do not pass security as an inline argument, instead they pass https (code-line). This cause the index-management tests in RC builds run with-security to fail with Not a valid SSL/TLS record: NotSslRecordException which translates to mismatch between http vs https. The protocol is set here conditionally to https via securityEnabled flag via https://github.com/opensearch-project/index-management/blob/bc10724d39ced73e9f05ab94a554033d338784ce/build.gradle#L514

• The culprit: https://github.com/opensearch-project/index-management/blob/bc10724d39ced73e9f05ab94a554033d338784ce/build.gradle#L331

This PR adds an additional check to toggle securityEnabled flag by checking if https was passed.

• The fix:

  def securityEnabled = System.getProperty("security", "false") == "true" || System.getProperty("https", "false") == "true"

CheckList:

• [ ] 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.

[DarshitChanpura]

@bowenlan-amzn @r1walz mind reviewing this one?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (4d8ef69) 75.37% compared to head (bc10724) 75.36%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1100 +/- ## ============================================ - Coverage 75.37% 75.36% -0.01% - Complexity 2813 2814 +1 ============================================ Files 367 367 Lines 17038 17038 Branches 2370 2370 ============================================ - Hits 12842 12841 -1 - Misses 2893 2894 +1 Partials 1303 1303 ```

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