chore: fix bump running out of memory (#24983)

The bump performs a full build of `aws-cdk-lib` right now, but it doesn't need to.

* Just run the `on-bump` scripts we need through `ts-node` instead. 
* Also make `@aws-cdk/cx-api` a copy of `aws-cdk-lib.cx-api`, same as `cloud-assembly-schema`. Move the `on-bump` script from `cx-api` to `aws-cdk-lib`.

----

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

bump.sh

@@ -20,4 +20,4 @@ if [[ "${LEGACY_BUMP:-}" == "" ]]; then
   #  if we're using 'cdk-release' for the bump, build that package, including all of its dependencies
   npx lerna run build --include-dependencies --scope @aws-cdk/cdk-release
 fi
-${scriptdir}/scripts/bump.js ${1:-minor}
+VERBOSE=1 exec ${scriptdir}/scripts/bump.js ${1:-minor}

packages/@aws-cdk/cloud-assembly-schema/package.json

@@ -48,7 +48,6 @@
     "build+test+package": "yarn build+test && yarn package",
     "build+test": "yarn build && yarn test",
     "compat": "cdk-compat",
-    "update-schema": "bash scripts/update-schema.sh",
     "rosetta:extract": "yarn --silent jsii-rosetta extract",
     "build+extract": "yarn build && yarn rosetta:extract",
     "build+test+extract": "yarn build+test && yarn rosetta:extract"

packages/@aws-cdk/cx-api/.gitignore

@@ -1,22 +1,9 @@
-*.js
-*.js.map
-*.d.ts
-node_modules
-dist
-tsconfig.json
-.jsii
-
-.LAST_BUILD
-.LAST_PACKAGE
-*.snk
-.nyc_output
-coverage
-nyc.config.js
-!.eslintrc.js
+# This package is copied from aws-cdk-lib/cloud-assembly-schema, ignore everything
+# except package.json
+*
+!package.json
+!.npmignore
 !jest.config.js
-
-junit.xml
-!**/*.snapshot/**/asset.*/*.js
-!**/*.snapshot/**/asset.*/*.d.ts
-
-!**/*.snapshot/**/asset.*/**
+!LICENSE
+!NOTICE
+!CONTRIBUTING.md