Update get_key to support multiple keys

[mavaylon1]

Motivation

What was the reasoning behind this change? Please explain the changes briefly.

This is the continuation of PR #964. Update the get_key method to return all the keys if there are multiple (instead of returning an error.

How to test the behavior?

Show how to reproduce the new behavior (can be a bug fix or a new feature)

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running ruff from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (97260bc) 88.57% compared to head (68fb02e) 88.57%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #999      +/-   ##
==========================================
- Coverage   88.57%   88.57%   -0.01%     
==========================================
  Files          45       45              
  Lines        9503     9502       -1     
  Branches     2702     2703       +1     
==========================================
- Hits         8417     8416       -1     
  Misses        764      764              
  Partials      322      322              

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