[OSD-19019] Enable bp-cli to consume warning header from bp API's response

[xiaoyu74]

What type of PR is this?

feature

What does this PR do / Why we need it?

To have bp-cli enabled to consume the warning header from bp-API's response, so that, when running managed-script with ocm-backplane, it can post warnings if the clusterVersions is not specified in the metadata.yaml but still allow the script continue execute.

It's interdependent with the MR-303

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[codecov-commenter]

Codecov Report

Merging #236 (dc54e07) into main (56b27b7) will decrease coverage by 0.03%.
The diff coverage is 33.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #236      +/-   ##
==========================================
- Coverage   51.72%   51.69%   -0.04%     
==========================================
  Files          51       51              
  Lines        3447     3449       +2     
==========================================
  Hits         1783     1783              
- Misses       1370     1371       +1     
- Partials      294      295       +1     

Files	Coverage Δ
cmd/ocm-backplane/managedJob/createManagedJob.go	72.36% <33.33%> (-0.97%)	⬇️

[samanthajayasinghe]

pls add a unit test to cover the new changes

[xiaoyu74]

pls add a unit test to cover the new changes

Since the MR for validating clusterversion in backplane-api has been merged, can we merge this interdependent PR-236 (which just to consume a custom warning header I defined in the API to log/print warning messages when end-user doesn't specify clusterVersions for managed-script in metadata.yaml) first.

We have a separate task https://issues.redhat.com/browse/OSD-19020 for writing test cases and I will add test case for bp-cli part accordingly.

[samanthajayasinghe]

/lgtm
/approve

[bmeng]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bmeng, samanthajayasinghe, xiaoyu74

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