Add `skuba migrate` command to upgrade projects to Node.js 20 #8979

Job	Run time
Integrate (express-rest-api)	59s
Lint & Test	1m 36s
Integrate (greeter)	2m 41s
Integrate (koa-rest-api)	1m 7s
Integrate (lambda-sqs-worker)	1m 20s
Integrate (lambda-sqs-worker-cdk)	1m 5s
Integrate (oss-npm-package)	57s
Integrate (private-npm-package)	59s
	10m 44s

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