Add security plugin to 2.1.0 manifest

[cliu123]

Issues Resolved

opensearch-project/security#1824

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[codecov-commenter]

Codecov Report

Merging #2147 (84ce10b) into main (67f7b3c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #2147   +/-   ##
=========================================
  Coverage     94.56%   94.56%           
  Complexity       25       25           
=========================================
  Files           204      204           
  Lines          4253     4253           
  Branches         29       29           
=========================================
  Hits           4022     4022           
  Misses          225      225           
  Partials          6        6           

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