Fix incorrect variable name and log message

[mjlshen]

What type of PR is this?

cleanup

What this PR does / Why we need it?

In #428 I mistakenly changed the variable name to proxyHealthCheckURL, but it was correct before. config.URL holds the backplane URL, not the proxy URL.

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

OSD-23471

Special notes for your reviewer

Pre-checks (if applicable)

• Ran unit tests locally
• Validated the changes in a cluster
• Included documentation changes with PR

[openshift-ci]

@mjlshen: all tests passed!

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 44.49%. Comparing base (ca7d234) to head (7a2015b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #429   +/-   ##
=======================================
  Coverage   44.49%   44.49%           
=======================================
  Files          63       63           
  Lines        5286     5286           
=======================================
  Hits         2352     2352           
  Misses       2617     2617           
  Partials      317      317           

Files	Coverage Δ
pkg/cli/config/config.go	80.73% <66.66%> (ø)

[bmeng]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bmeng, mjlshen

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