🐛 Fix broken SSM parameter path construction

[deifyed]

Description

• Removes magic from SSM parameter path construction

Motivation and Context

Turns out the original method did not support cluster names containing a dash

How to prove the effect of this PR?

Prove bug

1. Run okctl setup-mfa with an okctl version without this fix on a cluster
   containing a dash in the name
2. Verify that it is unable to retrieve the relevant SSM parameter

Prove fix

1. Run okctl setup-mfa on the same cluster with this PR
2. Verify that it is now able to retrieve the relevant SSM parameter

Additional info

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the release notes (for the next release).

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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