(cdk code pipeline): limit 10 assets concurrency

[alinasir85]

Receiving following error on Assets stage of cdk code pipeline

Error calling startBuild: Cannot have more than 10 builds in queue for the account (Service: AWSCodeBuild; Status Code: 400; Error Code: AccountLimitExceededException; Proxy: null)

There should be an automated retry feature implemented after the initial 10 builds. Currently, the process fails at this point, necessitating manual intervention to hit the retry button, thereby negating the advantages of an automated pipeline.