fix: use logger for iam changes log message

[typeid]

What type of PR is this?

bug

What this PR does / Why we need it?

The fmt.Println log message per default interferes with the -o env. This PR changes the Resolving... output to use the logger which won't affect the below:

export $(ocm backplane cloud credentials $CLUSTER_ID -o env)
bash: export: `resolve...': not a valid identifier

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

Resolves #

Special notes for your reviewer

Pre-checks (if applicable)

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

[supreeth7]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: supreeth7, typeid

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[openshift-ci]

@typeid: all tests passed!

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[codecov-commenter]

Codecov Report

Merging #268 (54c9e41) into main (d436794) will not change coverage.
The diff coverage is 0.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #268   +/-   ##
=======================================
  Coverage   48.53%   48.53%           
=======================================
  Files          52       52           
  Lines        3441     3441           
=======================================
  Hits         1670     1670           
  Misses       1510     1510           
  Partials      261      261           

Files	Coverage Δ
pkg/awsutil/sts.go	56.25% <0.00%> (ø)