Adds system index permission as allowed action under static drop down list

[DarshitChanpura]

Description

At present, the allowed action system:admin/system_index is not visible in the static drop down list and hence is not available to be assigned to a role. This PR adds that capability

Category

Bug fix

Issues Resolved

• Resolves system:admin/system_index permission not visible in index-permissions drop down #1697

Testing

• Should be present in Index permissions:
  

• Should not be present in cluster permissions:
  

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 ✅

Comparison is base (96a449f) 67.09% compared to head (1ef5ccc) 67.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1695   +/-   ##
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  Coverage   67.09%   67.09%           
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  Files          94       94           
  Lines        2404     2404           
  Branches      318      318           
=======================================
  Hits         1613     1613           
  Misses        713      713           
  Partials       78       78           

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[derek-ho]

Do we want to separate out the two functionality? It seems like this is packaging the index permission with some of the admin:admin work, but I am generally ok with this as is

[DarshitChanpura]

Do we want to separate out the two functionality? It seems like this is packaging the index permission with some of the admin:admin work, but I am generally ok with this as is

Its a relatively small change, and IMO is okay to merge.

[peternied]

Do we want to separate out the two functionality? It seems like this is packaging the index permission with some of the admin:admin work, but I am generally ok with this as is

Lets separate the permissions changes from the default password changes. The additional permissions option doesn't seem time sensitive and it would be good to make a clear PR / commit when we've been changing how passwords are handled.