Describe the feature

I'd like the new --concurrency option from #20345 to support cdk watch mode.

Use Case

In watch mode, I'd like my multi-stack apps to deploy stacks concurrently.

Proposed Solution

I have opened #21598.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

N/A

Environment details (OS name and version, etc.)

N/A