fix(dynamodb): avoid TableGrantsProps deprecation warnings for TableV2

[deveshsinghal09]

Issue # (if applicable)

Closes #37221

Summary

Fixes the aws-cdk-lib.aws_dynamodb.TableGrantsProps deprecation warnings emitted when using TableV2.

Problem

When using TableV2 (for instance, with DynamoEventSource), CDK internally calls table.grantStreamRead() which constructed TableGrantsProps using the explicitly deprecated policyResource and encryptedResource fields. This produced synthesis warnings that the user could not suppress:

[WARNING] aws-cdk-lib.aws_dynamodb.TableGrantsProps#policyResource is deprecated.
[WARNING] aws-cdk-lib.aws_dynamodb.TableGrantsProps#encryptedResource is deprecated.

Solution

Removed the explicit passing of the deprecated encryptedResource and policyResource from TableV2 and TableReplicaV2 constructors.
Since TableV2 (via CfnGlobalTable) natively implements IEncryptedResource (with grantOnKey) and IResourceWithPolicyV2 (with addToResourcePolicy), the IAM framework's native discovery inside TableGrants (via iam.EncryptedResources.of(this.table) and iam.ResourceWithPolicies.of(this.table)) will discover these resources automatically without them needing to be explicitly passed.

Changes

• packages/aws-cdk-lib/aws-dynamodb/lib/table-v2.ts: Removed encryptedResource and policyResource fields when instantiating TableGrants.

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Fixes must contain a change to a test file.
❌ Fixes must contain a change to an integration test file and the resulting snapshot.

If you believe this pull request should receive an exemption, please comment and provide a justification. A comment requesting an exemption should contain the text Exemption Request. Additionally, if clarification is needed, add Clarification Request to a comment.

✅ A exemption request has been requested. Please wait for a maintainer's review.

[deveshsinghal09]

Exemption Request: This PR fixes JSII deprecation warnings by removing the explicit passing of deprecated properties. It relies on existing native discovery of those properties, which is already covered by existing unit tests for the package.