[OSD-21438] Remove the fallback to old flow

[xiaoyu74]

What type of PR is this?

(feature)

What this PR does / Why we need it?

Remove fallback to old flow in backplane-cli and return the error

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

https://issues.redhat.com/browse/OSD-21438

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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[xiaoyu74]

/hold

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 45.06%. Comparing base (9569c12) to head (9fbf06a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #402      +/-   ##
==========================================
+ Coverage   44.59%   45.06%   +0.46%     
==========================================
  Files          62       62              
  Lines        5175     5122      -53     
==========================================
  Hits         2308     2308              
+ Misses       2549     2496      -53     
  Partials      318      318              

Files	Coverage Δ
cmd/ocm-backplane/cloud/common.go	28.57% <0.00%> (+8.45%)	⬆️

[AlexVulaj]

/lgtm

[openshift-ci]

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[Dee-6777]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexVulaj, Dee-6777, xiaoyu74

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[Dee-6777]

/unhold