Do not override KUBECONFIG when RunElevate

[Tof1973]

What type of PR is this?

bug

What this PR does / Why we need it?

When we call RunElevate, it overrides the definition of KUBECONFIG variable to a temporary file which is then deleted, which makes following kube commands to fail as there is no more configuration defined

Which Jira/Github issue(s) does this PR fix?

_Resolves #OSD-21061

Special notes for your reviewer

Once this will be implemented and delivered, osdctl will be updated to remove hack (openshift/osdctl#515)

Pre-checks (if applicable)

• [ x] Ran unit tests locally
• [ x] Validated the changes in a cluster
• [ na] Included documentation changes with PR

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (faf1879) 44.18% compared to head (882b659) 45.26%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #346      +/-   ##
==========================================
+ Coverage   44.18%   45.26%   +1.08%     
==========================================
  Files          54       54              
  Lines        4085     4204     +119     
==========================================
+ Hits         1805     1903      +98     
- Misses       2019     2031      +12     
- Partials      261      270       +9     

Files	Coverage Δ
pkg/elevate/elevate.go	82.45% <55.55%> (-5.30%)	⬇️

... and 1 file with indirect coverage changes

[samanthajayasinghe]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: samanthajayasinghe, Tof1973

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[openshift-ci]

@Tof1973: all tests passed!

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