(autoscaling): applyCloudFormationInit on each launchTemplateOverrides of mixedInstancesPolicy

[BDeus]

Describe the bug

Reopening of #27030

In the Construct AutoscalingGroup when setting a CloudFormationInit, the UserData is apply on the LaunchTemplate attach to the ASG. (attach here)
In case of using a MixedInstancesPolicy with LaunchTemplateOverrides, the templates overrides do not inherit from the UserData of the CloudFormationInit.

Regression Issue

• Select this option if this issue appears to be a regression.

Last Known Working CDK Version

No response

Expected Behavior

Set the CfnSignals in all LaunchTemplates of the AutoscalingGroup when a CloudFormationInit is attach.

aws-cdk/packages/aws-cdk-lib/aws-ec2/lib/cfn-init.ts

Line 157 in a3863a6

attachOptions.userData.addCommands(

Current Behavior

The UserData build by the AutoscalingGroup and the Cloudformation does not set the signals on the overrides template, only on the default one.

Reproduction Steps

Create an AutoscalingGroup with a MixedInstancesPolicy with two LaunchTemplates
Attach a CloudFormationInit to the AutoscalingGroup.
On synthetize, all LaunchTemplates need to have the signals generate by the CloudFormationInit

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.123.0

Framework Version

No response

Node.js Version

20.11.1

OS

macos

Language

TypeScript, Java

Language Version

No response

Other information

No response

[khushail]

Hi @BDeus , Thanks for reaching out.
Could you please share the minimal reproducible sample code for the issue mentioned. It would also be very helpful if you could share the synthesized template as well.

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