Remove service accounts from Main

[derek-ho]

Description

Service account pages/code was introduced in main but never backported to 2.x. This code difference caused backports involving internalusers code to fail, leading to manual backports and conflict resolution errors. This removes that code since there is no current path forward for service accounts, so backports won't fail anymore. If and when there is a plan to bring service accounts to main and 2.x, we can re-introduce that code.

Category

Maintenance

Why these changes are required?

Fix #2005

What is the old behavior before changes and new behavior after changes?

Service accounts code doesn't exist in main anymore

Issues Resolved

Fix #2005

Testing

Existing tests pass, manual testing

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.36%. Comparing base (0592b68) to head (c214213).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2041      +/-   ##
==========================================
- Coverage   70.61%   70.36%   -0.25%     
==========================================
  Files          97       96       -1     
  Lines        2600     2541      -59     
  Branches      387      370      -17     
==========================================
- Hits         1836     1788      -48     
+ Misses        668      660       -8     
+ Partials       96       93       -3     

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[derek-ho]

@cwperks @DarshitChanpura can you also review this PR in the FTR related to this change opensearch-project/opensearch-dashboards-functional-test#1444? Running those tests as part of this repo is showing useful as we can catch changes that will affect these tests as part of the PR process.