fix(sqs): encryptionType is incorrect when encryptionMasterKey is provided

[mrgrain]

In #19796 we added additional validation to sns subscription.
For that purpose the Queue encryptionType was exposed as a public property.
However the PR forgot to take into account that the provided encryption property is automatically changed when a encryptionMasterKey is provided.

This PR ensures that the public encryptionType has the correct value.

Additionally, adds a warning for an incorrect configuration scenario where encryptionMasterKey is provided together with an encryption other than QueueEncryption.KMS.
This feature was supposed to allow users to simply provide an encryption key and have the encryption type being selected automatically.
However it now unintentionally allows for wrong configurations that are silently fixed, e.g. setting QueueEncryption.UNENCRYPTED and providing an encryption key.
The warning keeps backwards compatibility, but instructs users to fix their configuration.

Closes #26719

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[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[mrgrain]

pr-linter/exempt-integ-test because this changes in memory properties and validation only.

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).