chore(dynamodb): remove single quotes from throw statement in the parseEncryption method (#30417)

Removed the single quotes around the error message string to allow proper interpolation of the ${encryptionType} variable. 

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: mazyu36

packages/aws-cdk-lib/aws-dynamodb/lib/table.ts

@@ -1630,7 +1630,7 @@ export class Table extends TableBase {
     }
 
     if (encryptionType !== TableEncryption.CUSTOMER_MANAGED && props.encryptionKey) {
-      throw new Error('`encryptionKey cannot be specified unless encryption is set to TableEncryption.CUSTOMER_MANAGED (it was set to ${encryptionType})`');
+      throw new Error(`encryptionKey cannot be specified unless encryption is set to TableEncryption.CUSTOMER_MANAGED (it was set to ${encryptionType})`);
     }
 
     if (encryptionType === TableEncryption.CUSTOMER_MANAGED && props.replicationRegions) {

packages/aws-cdk-lib/aws-dynamodb/test/dynamodb.test.ts

@@ -466,7 +466,7 @@ test('fails if encryption key is used with AWS managed CMK', () => {
     partitionKey: TABLE_PARTITION_KEY,
     encryption: TableEncryption.AWS_MANAGED,
     encryptionKey,
-  })).toThrow('`encryptionKey cannot be specified unless encryption is set to TableEncryption.CUSTOMER_MANAGED (it was set to ${encryptionType})`');
+  })).toThrow(`encryptionKey cannot be specified unless encryption is set to TableEncryption.CUSTOMER_MANAGED (it was set to ${TableEncryption.AWS_MANAGED})`);
 });
 
 test('fails if encryption key is used with default encryption', () => {
@@ -479,7 +479,7 @@ test('fails if encryption key is used with default encryption', () => {
     partitionKey: TABLE_PARTITION_KEY,
     encryption: TableEncryption.DEFAULT,
     encryptionKey,
-  })).toThrow('`encryptionKey cannot be specified unless encryption is set to TableEncryption.CUSTOMER_MANAGED (it was set to ${encryptionType})`');
+  })).toThrow(`encryptionKey cannot be specified unless encryption is set to TableEncryption.CUSTOMER_MANAGED (it was set to ${TableEncryption.DEFAULT})`);
 });
 
 testDeprecated('fails if encryption key is used with serverSideEncryption', () => {