fix: CheckIdentityKeyExists was comparing to constant

[bnevis-i]

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)

Testing Instructions

make test

New Dependency Instructions (If applicable)

[chr1shung]

LGTM

[codecov-commenter]

Codecov Report

Merging #192 (f07b63b) into main (9c30f8a) will increase coverage by 1.24%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
+ Coverage   69.47%   70.71%   +1.24%     
==========================================
  Files          18       18              
  Lines        1284     1284              
==========================================
+ Hits          892      908      +16     
+ Misses        308      290      -18     
- Partials       84       86       +2     

Impacted Files	Coverage Δ
internal/pkg/vault/management.go	67.00% <100.00%> (+4.06%)	⬆️

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