fix(ibmsm): Copy keys from KV types

[jkayani]

Description

After #517 , AVP was not handling KV secrets correctly, leaving the KV pairs of a kv secret in the data key of the returned secret's JSON instead of extracting them for individual interpolation like before. This PR restores the original behavior.

A test case was added to verify this issue (fails on HEAD) and I've verified in an e2e test that this appears to be fix the issue

Fixes: #534

Checklist

Please make sure that your PR fulfills the following requirements:

• Reviewed the guidelines for contributing to this repository
• The commit message follows the Conventional Commits Guidelines.
• Tests for the changes have been updated
• Are you adding dependencies? If so, please run go mod tidy -compat=1.17 to ensure only the minimum is pulled in.
• Docs have been added / updated
• Optional. My organization is added to USERS.md.

Type of Change

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

Other information

[craneer]

Is there any idea when a new release containing this update will occure?

[codecov-commenter]

Codecov Report

Merging #535 (5ecf52a) into main (4b074c7) will increase coverage by 0.64%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #535      +/-   ##
==========================================
+ Coverage   70.65%   71.29%   +0.64%     
==========================================
  Files          26       26              
  Lines        1949     1951       +2     
==========================================
+ Hits         1377     1391      +14     
+ Misses        472      460      -12     
  Partials      100      100              

Files Changed	Coverage Δ
pkg/backends/ibmsecretsmanager.go	63.47% <50.00%> (+2.77%)	⬆️

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