### Description Backport On-Behalf-Of Authentication into 2.x branch ### Related Issues * Relate #2573 ### Exit Criteria Backport the following changes: **Part 1:** https://github.com/opensearch-project/security/pull/3563 resolves the following: - - [x] #3179 - - [x] #3270 - - [x] #3419 - - [x] #3428 - - [x] #3553 - - [x] https://github.com/opensearch-project/security/pull/3579 **Part 2:** https://github.com/opensearch-project/security/pull/3595 resolves the following: - - [x] #3421