log when we discard proxies and default to the first proxy if all fail healthchecks

[mjlshen]

What type of PR is this?

bug

What this PR does / Why we need it?

The message

WARN[0002] No proxy configuration available. This may result in failing commands as backplane-api is only available from select networks.

is misleading when a proxies are specified, but they are failing health checks. This PR adds logging when proxies are discarded and falls back to selecting the first specified proxy if all fail health checks.

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 44.49%. Comparing base (59d5cbc) to head (987d8a0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #428      +/-   ##
==========================================
+ Coverage   44.24%   44.49%   +0.25%     
==========================================
  Files          63       63              
  Lines        5282     5286       +4     
==========================================
+ Hits         2337     2352      +15     
+ Misses       2624     2617       -7     
+ Partials      321      317       -4     

Files	Coverage Δ
pkg/cli/config/config.go	80.73% <83.33%> (+5.49%)	⬆️

... and 1 file with indirect coverage changes

[samanthajayasinghe]

/lgtm

[openshift-ci]

@mjlshen: all tests passed!

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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