fix: condition on the creation of the kms key

[schniber]

Description

this PR fixes #1278

Note: The whole PR is used as commit message.

Migrations required

No

Verification

I did deploy this module with both options, i.e. enable_managed_kms_key = true and enable_managed_kms_key = false to validate the fix

[github-actions]

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[schniber]

@npalm : Hey, is it possible to peer review this ?
Happy to iterate based on your inputs.

Bests.

[schniber]

Hey @kayman-mk,

Any chance of approving this after your review ?

Thanks a lot.

Bests