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

[meniluca]

We are also impacted by #1278 and looking forward to updating the runner to the latest version.

[kayman-mk]

This change is now incompatible for those guys using a customer managed key. The module can be updated without setting the new variable to true resulting in an outage, I guess or at least using the wrong keys to encrypt the resources.

Not sure how this can be solved.