Run integ tests in the sample plugin with tests.security.manager set to true

[cwperks]

Description

Companion core PR: opensearch-project/OpenSearch#18988

The checks for the integ tests in the sample plugin will fail until the core PR is merged.

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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 69.80%. Comparing base (0bab682) to head (20d8ea5).
⚠️ Report is 6 commits behind head on main.

❌ Your project status has failed because the head coverage (69.80%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #809      +/-   ##
==========================================
- Coverage   69.92%   69.80%   -0.12%     
==========================================
  Files          38       38              
  Lines        1729     1729              
  Branches      156      156              
==========================================
- Hits         1209     1207       -2     
- Misses        430      431       +1     
- Partials       90       91       +1     

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