Prevent AWS::SecretsManager::Secret from generating new secret when updating "SecretStringTemplate" under "GenerateSecretString"

### Name of the resource

AWS::SecretsManager::Secret

### Resource name

_No response_

### Description

When using property `GenerateSecretString` in `AWS::SecretsManager::Secret` it is possible to specify other parameters in `SecretStringTemplate` other than the secret. However when updating any parameter in `SecretStringTemplate`, `AWS::SecretsManager::Secret` will generate new secret after each update.

It should be possible to update parameters in `SecretStringTemplate` without generating new secret after each update.

### Other Details

_No response_

Start with the AWS::SecretsManager::Secret resource and review the GenerateSecretString and SecretStringTemplate behavior described in the issue. Confirm how updates are handled, then verify that changing template parameters no longer generates a new secret while other secret-generation behavior remains unchanged.

Written by the indexing model from the issue text.