fix(redshift): enableRebootForParameterChanges fails synth with "cann…

…ot find entry file…" (#28760)

Error:
```
Error: Cannot find entry file at /node_modules/@aws-cdk/custom-resource-handlers/dist/
aws-redshift-alpha/asset-deployment-handler/index.js
```

This PR fixes the same issue detailed in #28658 but for `aws-redshift-alpha` as both modules have the same issue with accessing `custom-resource-handlers`. 

This PR uses the same airlift mechanism as `aws-cdk-lib` to move the necessary files into the `aws-redshift-alpha` package so its structure now looks like this:
```
|-- @aws-cdk 
    |-- aws-redshift-alpha
        |-- custom-resource-handlers/dist/aws-redshift-alpha // airlifted in via this PR
    |-- custom-resource-handlers/dist
        |-- aws-redshift-alpha
```

The airlift script only moves the `index.js` file and not the `*/generated.ts` files because imports in alpha module `*/generated.ts` files do not currently work since the import paths were written to only support stable modules in `aws-cdk-lib`. 

I've tested the `aws-redshift-alpha` package locally on a local CDK app and confirmed the necessary structure exists in the packaged module. The local app calls the `cluster.enableRebootForParameterChanges()` method which creates the custom resource and I was able to verify that the cluster deploys properly and is rebootable. 

Related to #28633 but this is the fix for `aws-redshift-alpha`

----

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

packages/@aws-cdk/aws-redshift-alpha/.npmignore

@@ -27,3 +27,6 @@ junit.xml
 test/
 !*.lit.ts
 **/*.snapshot
+
+# include custom-resource-handlers
+!custom-resource-handlers/*

packages/@aws-cdk/aws-redshift-alpha/lib/cluster.ts

@@ -713,7 +713,7 @@ export class Cluster extends ClusterBase {
     const rebootFunction = new lambda.SingletonFunction(this, 'RedshiftClusterRebooterFunction', {
       uuid: '511e207f-13df-4b8b-b632-c32b30b65ac2',
       runtime: lambda.Runtime.NODEJS_18_X,
-      code: lambda.Code.fromAsset(path.join(__dirname, '..', '..', 'custom-resource-handlers', 'dist', 'aws-redshift-alpha', 'cluster-parameter-change-reboot-handler')),
+      code: lambda.Code.fromAsset(path.join(__dirname, '..', 'custom-resource-handlers', 'dist', 'aws-redshift-alpha', 'cluster-parameter-change-reboot-handler')),
       handler: 'index.handler',
       timeout: Duration.seconds(900),
     });

packages/@aws-cdk/aws-redshift-alpha/package.json

@@ -66,7 +66,10 @@
   "cdk-build": {
     "env": {
       "AWSLINT_BASE_CONSTRUCT": true
-    }
+    },
+    "pre": [
+      "./scripts/airlift-custom-resource-handlers.sh"
+    ]
   },
   "keywords": [
     "aws",

packages/@aws-cdk/aws-redshift-alpha/scripts/airlift-custom-resource-handlers.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+scriptdir=$(cd $(dirname $0) && pwd)
+customresourcedir=$(node -p "path.dirname(require.resolve('@aws-cdk/custom-resource-handlers/package.json'))")
+awscdklibdir=${scriptdir}/..
+
+function airlift() {
+  if [[ $1 != dist/core/nodejs-entrypoint-handler && ($1 = dist/core || $1 = dist/core/*) ]];
+    then
+      mkdir -p $awscdklibdir/core/lib/$1
+      cp $customresourcedir/$2 $awscdklibdir/core/lib/$1
+    else
+      mkdir -p $awscdklibdir/custom-resource-handlers/$1
+      cp $customresourcedir/$2 $awscdklibdir/custom-resource-handlers/$1
+  fi
+}
+
+recurse() {
+  local dir=$1
+
+  for file in $dir/*; do
+    if [ -f $file ]; then
+      case $file in
+        $customresourcedir/dist/aws-redshift-alpha/*/index.*)
+          cr=$(echo $file | rev | cut -d "/" -f 2-4 | rev)
+          airlift $cr $cr/index.*
+          ;;
+      esac
+    fi
+
+    if [ -d $file ]; then
+      recurse $file
+    fi
+  done
+}
+
+recurse $customresourcedir/dist

packages/@aws-cdk/custom-resource-handlers/README.md

@@ -16,12 +16,15 @@ and included as part of the `aws-cdk-lib` package.
 ### Experimental:
 
 - aws-amplify-alpha/asset-deployment-handler
+- aws-redshift-alpha/asset-deployment-handler
 
 These handlers are excluded from `aws-cdk-lib/custom-resource-handlers` and are individually
 copied into their respective `-alpha` packages at build time. When an `-alpha` package is
 stabilized, part of the stabilization process **must** be to remove `-alpha` from the folder
 name, so that it is included in `aws-cdk-lib`.
 
+`*/generated.ts` files are not supported for alpha modules due to import paths that only work for stable modules in `aws-cdk-lib`. These files must be added to `custom-resources-framework/config.ts` as `ComponentType.NO_OP`.
+
 ## Nodejs Entrypoint
 
 This package also includes `nodejs-entrypoint.ts`, which is a wrapper that talks to

packages/@aws-cdk/custom-resource-handlers/lib/custom-resources-framework/config.ts

@@ -226,7 +226,7 @@ export const config: HandlerFrameworkConfig = {
   'aws-redshift-alpha': {
     'cluster-reboot-provider': [
       {
-        type: ComponentType.SINGLETON_FUNCTION,
+        type: ComponentType.NO_OP,
         sourceCode: path.resolve(__dirname, '..', 'aws-redshift-alpha', 'cluster-parameter-change-reboot-handler', 'index.ts'),
       },
     ],